# tzdb data for Asia and environs
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
# This file is by no means authoritative; if you think you know better,
# go ahead and edit the file (and please send any changes to
# tz@iana.org for general use in the future). For more, please see
# the file CONTRIBUTING in the tz distribution.
# From Paul Eggert (2019-07-11):
#
# Unless otherwise specified, the source for data through 1990 is:
# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
# San Diego: ACS Publications, Inc. (2003).
# Unfortunately this book contains many errors and cites no sources.
#
# Many years ago Gwillim Law wrote that a good source
# for time zone data was the International Air Transport
# Association's Standard Schedules Information Manual (IATA SSIM),
# published semiannually. Law sent in several helpful summaries
# of the IATA's data after 1990. Except where otherwise noted,
# IATA SSIM is the source for entries after 1990.
#
# Another source occasionally used is Edward W. Whitman, World Time Differences,
# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
# I found in the UCLA library.
#
# For data circa 1899, a common source is:
# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
# https://www.jstor.org/stable/1774359
#
# For Russian data circa 1919, a source is:
# Byalokoz EL. New Counting of Time in Russia since July 1, 1919.
# (See the 'europe' file for a fuller citation.)
#
# The following alphabetic abbreviations appear in these tables
# (corrections are welcome):
# std dst
# LMT Local Mean Time
# 2:00 EET EEST Eastern European Time
# 2:00 IST IDT Israel
# 5:30 IST India
# 7:00 WIB west Indonesia (Waktu Indonesia Barat)
# 8:00 WITA central Indonesia (Waktu Indonesia Tengah)
# 8:00 CST China
# 8:00 HKT HKST Hong Kong (HKWT* for Winter Time in late 1941)
# 8:00 PST PDT* Philippines
# 8:30 KST KDT Korea when at +0830
# 9:00 WIT east Indonesia (Waktu Indonesia Timur)
# 9:00 JST JDT Japan
# 9:00 KST KDT Korea when at +09
# *I invented the abbreviations HKWT and PDT; see below.
# Otherwise, these tables typically use numeric abbreviations like +03
# and +0330 for integer hour and minute UT offsets. Although earlier
# editions invented alphabetic time zone abbreviations for every
# offset, this did not reflect common practice.
#
# See the 'europe' file for Russia and Turkey in Asia.
# From Guy Harris:
# Incorporates data for Singapore from Robert Elz' asia 1.1, as well as
# additional information from Tom Yap, Sun Microsystems Intercontinental
# Technical Support (including a page from the Official Airline Guide -
# Worldwide Edition).
###############################################################################
# These rules are stolen from the 'europe' file.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule EUAsia 1981 max - Mar lastSun 1:00u 1:00 S
Rule EUAsia 1979 1995 - Sep lastSun 1:00u 0 -
Rule EUAsia 1996 max - Oct lastSun 1:00u 0 -
Rule E-EurAsia 1981 max - Mar lastSun 0:00 1:00 -
Rule E-EurAsia 1979 1995 - Sep lastSun 0:00 0 -
Rule E-EurAsia 1996 max - Oct lastSun 0:00 0 -
Rule RussiaAsia 1981 1984 - Apr 1 0:00 1:00 -
Rule RussiaAsia 1981 1983 - Oct 1 0:00 0 -
Rule RussiaAsia 1984 1995 - Sep lastSun 2:00s 0 -
Rule RussiaAsia 1985 2010 - Mar lastSun 2:00s 1:00 -
Rule RussiaAsia 1996 2010 - Oct lastSun 2:00s 0 -
# Afghanistan
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Kabul 4:36:48 - LMT 1890
4:00 - +04 1945
4:30 - +0430
# Armenia
# From Paul Eggert (2006-03-22):
# Shanks & Pottenger have Yerevan switching to 3:00 (with Russian DST)
# in spring 1991, then to 4:00 with no DST in fall 1995, then
# readopting Russian DST in 1997. Go with Shanks & Pottenger, even
# when they disagree with others. Edgar Der-Danieliantz
# reported (1996-05-04) that Yerevan probably wouldn't use DST
# in 1996, though it did use DST in 1995. IATA SSIM (1991/1998) reports that
# Armenia switched from 3:00 to 4:00 in 1998 and observed DST after 1991,
# but started switching at 3:00s in 1998.
# From Arthur David Olson (2011-06-15):
# While Russia abandoned DST in 2011, Armenia may choose to
# follow Russia's "old" rules.
# From Alexander Krivenyshev (2012-02-10):
# According to News Armenia, on Feb 9, 2012,
# http://newsarmenia.ru/society/20120209/42609695.html
#
# The Armenia National Assembly adopted final reading of Amendments to the
# Law "On procedure of calculation time on the territory of the Republic of
# Armenia" according to which Armenia [is] abolishing Daylight Saving Time.
# or
# (brief)
# http://www.worldtimezone.com/dst_news/dst_news_armenia03.html
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Armenia 2011 only - Mar lastSun 2:00s 1:00 -
Rule Armenia 2011 only - Oct lastSun 2:00s 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Yerevan 2:58:00 - LMT 1924 May 2
3:00 - +03 1957 Mar
4:00 RussiaAsia +04/+05 1991 Mar 31 2:00s
3:00 RussiaAsia +03/+04 1995 Sep 24 2:00s
4:00 - +04 1997
4:00 RussiaAsia +04/+05 2011
4:00 Armenia +04/+05
# Azerbaijan
# From Rustam Aliyev of the Azerbaijan Internet Forum (2005-10-23):
# According to the resolution of Cabinet of Ministers, 1997
# From Paul Eggert (2015-09-17): It was Resolution No. 21 (1997-03-17).
# http://code.az/files/daylight_res.pdf
# From Steffen Thorsen (2016-03-17):
# ... the Azerbaijani Cabinet of Ministers has cancelled switching to
# daylight saving time....
# https://www.azernews.az/azerbaijan/94137.html
# http://vestnikkavkaza.net/news/Azerbaijani-Cabinet-of-Ministers-cancels-daylight-saving-time.html
# http://en.apa.az/xeber_azerbaijan_abolishes_daylight_savings_ti_240862.html
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Azer 1997 2015 - Mar lastSun 4:00 1:00 -
Rule Azer 1997 2015 - Oct lastSun 5:00 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Baku 3:19:24 - LMT 1924 May 2
3:00 - +03 1957 Mar
4:00 RussiaAsia +04/+05 1991 Mar 31 2:00s
3:00 RussiaAsia +03/+04 1992 Sep lastSun 2:00s
4:00 - +04 1996
4:00 EUAsia +04/+05 1997
4:00 Azer +04/+05
# Bangladesh
# From Alexander Krivenyshev (2009-05-13):
# According to newspaper Asian Tribune (May 6, 2009) Bangladesh may introduce
# Daylight Saving Time from June 16 to Sept 30
#
# Bangladesh to introduce daylight saving time likely from June 16
# http://www.asiantribune.com/?q=node/17288
# http://www.worldtimezone.com/dst_news/dst_news_bangladesh02.html
#
# "... Bangladesh government has decided to switch daylight saving time from
# June
# 16 till September 30 in a bid to ensure maximum use of daylight to cope with
# crippling power crisis. "
#
# The switch will remain in effect from June 16 to Sept 30 (2009) but if
# implemented the next year, it will come in force from April 1, 2010
# From Steffen Thorsen (2009-06-02):
# They have finally decided now, but changed the start date to midnight between
# the 19th and 20th, and they have not set the end date yet.
#
# Some sources:
# https://in.reuters.com/article/southAsiaNews/idINIndia-40017620090601
# http://bdnews24.com/details.php?id=85889&cid=2
#
# Our wrap-up:
# https://www.timeanddate.com/news/time/bangladesh-daylight-saving-2009.html
# From A. N. M. Kamrus Saadat (2009-06-15):
# Finally we've got the official mail regarding DST start time where DST start
# time is mentioned as Jun 19 2009, 23:00 from BTRC (Bangladesh
# Telecommunication Regulatory Commission).
#
# No DST end date has been announced yet.
# From Alexander Krivenyshev (2009-09-25):
# Bangladesh won't go back to Standard Time from October 1, 2009,
# instead it will continue DST measure till the cabinet makes a fresh decision.
#
# Following report by same newspaper-"The Daily Star Friday":
# "DST change awaits cabinet decision-Clock won't go back by 1-hr from Oct 1"
# http://www.thedailystar.net/newDesign/news-details.php?nid=107021
# http://www.worldtimezone.com/dst_news/dst_news_bangladesh04.html
# From Steffen Thorsen (2009-10-13):
# IANS (Indo-Asian News Service) now reports:
# Bangladesh has decided that the clock advanced by an hour to make
# maximum use of daylight hours as an energy saving measure would
# "continue for an indefinite period."
#
# One of many places where it is published:
# http://www.thaindian.com/newsportal/business/bangladesh-to-continue-indefinitely-with-advanced-time_100259987.html
# From Alexander Krivenyshev (2009-12-24):
# According to Bangladesh newspaper "The Daily Star,"
# Bangladesh will change its clock back to Standard Time on Dec 31, 2009.
#
# Clock goes back 1-hr on Dec 31 night.
# http://www.thedailystar.net/newDesign/news-details.php?nid=119228
# http://www.worldtimezone.com/dst_news/dst_news_bangladesh05.html
#
# "...The government yesterday decided to put the clock back by one hour
# on December 31 midnight and the new time will continue until March 31,
# 2010 midnight. The decision came at a cabinet meeting at the Prime
# Minister's Office last night..."
# From Alexander Krivenyshev (2010-03-22):
# According to Bangladesh newspaper "The Daily Star,"
# Cabinet cancels Daylight Saving Time
# http://www.thedailystar.net/newDesign/latest_news.php?nid=22817
# http://www.worldtimezone.com/dst_news/dst_news_bangladesh06.html
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Dhaka 2009 only - Jun 19 23:00 1:00 -
Rule Dhaka 2009 only - Dec 31 24:00 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Dhaka 6:01:40 - LMT 1890
5:53:20 - HMT 1941 Oct # Howrah Mean Time?
6:30 - +0630 1942 May 15
5:30 - +0530 1942 Sep
6:30 - +0630 1951 Sep 30
6:00 - +06 2009
6:00 Dhaka +06/+07
# Bhutan
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Thimphu 5:58:36 - LMT 1947 Aug 15 # or Thimbu
5:30 - +0530 1987 Oct
6:00 - +06
# British Indian Ocean Territory
# Whitman and the 1995 CIA time zone map say 5:00, but the
# 1997 and later maps say 6:00. Assume the switch occurred in 1996.
# We have no information as to when standard time was introduced;
# assume it occurred in 1907, the same year as Mauritius (which
# then contained the Chagos Archipelago).
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Indian/Chagos 4:49:40 - LMT 1907
5:00 - +05 1996
6:00 - +06
# Cocos (Keeling) Islands
# Myanmar (Burma)
# Milne says 6:24:40 was the meridian of the time ball observatory at Rangoon.
# From Paul Eggert (2017-04-20):
# Page 27 of Reed & Low (cited for Asia/Kolkata) says "Rangoon local time is
# used upon the railways and telegraphs of Burma, and is 6h. 24m. 47s. ahead
# of Greenwich." This refers to the period before Burma's transition to +0630,
# a transition for which Shanks is the only source.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Yangon 6:24:47 - LMT 1880 # or Rangoon
6:24:47 - RMT 1920 # Rangoon local time
6:30 - +0630 1942 May
9:00 - +09 1945 May 3
6:30 - +0630
# China
# From Phake Nick (2020-04-15):
# According to this news report:
# http://news.sina.com.cn/c/2004-09-01/19524201403.shtml
# on April 11, 1919, newspaper in Shanghai said clocks in Shanghai will spring
# forward for an hour starting from midnight of that Saturday. The report did
# not mention what happened in Shanghai thereafter, but it mentioned that a
# similar trial in Tianjin which ended at October 1st as citizens are told to
# recede the clock on September 30 from 12:00pm to 11:00pm. The trial at
# Tianjin got terminated in 1920.
#
# From Paul Eggert (2020-04-15):
# The Returns of Trade and Trade Reports, page 711, says "Daylight saving was
# given a trial during the year, and from the 12th April to the 1st October
# the clocks were all set one hour ahead of sun time. Though the scheme was
# generally esteemed a success, it was announced early in 1920 that it would
# not be repeated."
#
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Shang 1919 only - Apr 12 24:00 1:00 D
Rule Shang 1919 only - Sep 30 24:00 0 S
# From Paul Eggert (2018-10-02):
# The following comes from Table 1 of:
# Li Yu. Research on the daylight saving movement in 1940s Shanghai.
# Nanjing Journal of Social Sciences. 2014;(2):144-50.
# http://oversea.cnki.net/kns55/detail.aspx?dbname=CJFD2014&filename=NJSH201402020
# The table lists dates only; I am guessing 00:00 and 24:00 transition times.
# Also, the table lists the planned end of DST in 1949, but the corresponding
# zone line cuts this off on May 28, when the Communists took power.
# From Phake Nick (2020-04-15):
#
# For the history of time in Shanghai between 1940-1942, the situation is
# actually slightly more complex than the table [below].... At the time,
# there were three different authorities in Shanghai, including Shanghai
# International Settlement, a settlement established by western countries with
# its own westernized form of government, Shanghai French Concession, similar
# to the international settlement but is controlled by French, and then the
# rest of the city of Shanghai, which have already been controlled by Japanese
# force through a puppet local government (Wang Jingwei regime). It was
# additionally complicated by the circumstances that, according to the 1940s
# Shanghai summer time essay cited in the database, some
# departments/businesses/people in the Shanghai city itself during that time
# period, refused to change their clock and instead only changed their opening
# hours.
#
# For example, as quoted in the article, in 1940, other than the authority
# itself, power, tram, bus companies, cinema, department stores, and other
# public service organizations have all decided to follow the summer time and
# spring forward the clock. On the other hand, the custom office refused to
# spring forward the clock because of worry on mechanical wear to the physical
# clock, postal office refused to spring forward because of disruption to
# business and log-keeping, although they did changed their office hour to
# match rest of the city. So is travel agents, and also weather
# observatory. It is said both time standards had their own supporters in the
# city at the time, those who prefer new time standard would have moved their
# clock while those who prefer the old time standard would keep their clock
# unchange, and there were different clocks that use different time standard
# in the city at the time for people who use different time standard to adjust
# their clock to their preferred time.
#
# a. For the 1940 May 31 spring forward, the essay [says] ... "Hong
# Kong government implemented the spring forward in the same time on
# the same date as Shanghai".
#
# b. For the 1940 fall back, it was said that they initially intended to do
# so on September 30 00:59 at night, however they postponed it to October 12
# after discussion with relevant parties. However schools restored to the
# original schedule ten days earlier.
#
# c. For the 1941 spring forward, it is said to start from March 15
# "following the previous year's method", and in addition to that the essay
# cited an announcement in 1941 from the Wang regime which said the Special
# City of Shanghai under Wang regime control will follow the DST rule set by
# the Settlements, irrespective of the original DST plan announced by the Wang
# regime for other area under its control(April 1 to September 30). (no idea
# to situation before that announcement)
#
# d. For the 1941 fall back, it was said that the fall back would occurs at
# the end of September (A newspaper headline cited by the essay, published on
# October 1, 1941, have the headlines which said "French Concession would
# rewind to the old clock this morning), but it ultimately didn't happen due
# to disagreement between the international settlement authority and the
# French concession authority, and the fall back ultimately occurred on
# November 1.
#
# e. In 1941 December, Japan have officially started war with the United
# States and the United Kingdom, and in Shanghai they have marched into the
# international settlement, taken over its control
#
# f. For the 1942 spring forward, the essay said that the spring forward
# started on January 31. It said this time the custom office and postal
# department will also change their clocks, unlike before.
#
# g. The essay itself didn't cover any specific changes thereafter until the
# end of the war, it quoted a November 1942 command from the government of the
# Wang regime, which claim the daylight saving time applies year round during
# the war. However, the essay ambiguously said the period is "February 1 to
# September 30", which I don't really understand what is the meaning of such
# period in the context of year round implementation here.. More researches
# might be needed to show exactly what happened during that period of time.
# From Phake Nick (2020-04-15):
# According to a Japanese tour bus pamphlet in Nanjing area believed to be
# from around year 1941: http://www.tt-museum.jp/tairiku_0280_nan1941.html ,
# the schedule listed was in the format of Japanese time. Which indicate some
# use of the Japanese time (instead of syncing by DST) might have occurred in
# the Yangtze river delta area during that period of time although the scope
# of such use will need to be investigated to determine.
#
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Shang 1940 only - Jun 1 0:00 1:00 D
Rule Shang 1940 only - Oct 12 24:00 0 S
Rule Shang 1941 only - Mar 15 0:00 1:00 D
Rule Shang 1941 only - Nov 1 24:00 0 S
Rule Shang 1942 only - Jan 31 0:00 1:00 D
Rule Shang 1945 only - Sep 1 24:00 0 S
Rule Shang 1946 only - May 15 0:00 1:00 D
Rule Shang 1946 only - Sep 30 24:00 0 S
Rule Shang 1947 only - Apr 15 0:00 1:00 D
Rule Shang 1947 only - Oct 31 24:00 0 S
Rule Shang 1948 1949 - May 1 0:00 1:00 D
Rule Shang 1948 1949 - Sep 30 24:00 0 S #plan
# From Guy Harris:
# People's Republic of China. Yes, they really have only one time zone.
# From Bob Devine (1988-01-28):
# No they don't. See TIME mag, 1986-02-17 p.52. Even though
# China is across 4 physical time zones, before Feb 1, 1986 only the
# Peking (Beijing) time zone was recognized. Since that date, China
# has two of 'em - Peking's and Ürümqi (named after the capital of
# the Xinjiang Uyghur Autonomous Region). I don't know about DST for it.
#
# . . .I just deleted the DST table and this editor makes it too
# painful to suck in another copy. So, here is what I have for
# DST start/end dates for Peking's time zone (info from AP):
#
# 1986 May 4 - Sept 14
# 1987 mid-April - ??
# From U. S. Naval Observatory (1989-01-19):
# CHINA 8 H AHEAD OF UTC ALL OF CHINA, INCL TAIWAN
# CHINA 9 H AHEAD OF UTC APR 17 - SEP 10
# From Paul Eggert (2008-02-11):
# Jim Mann, "A clumsy embrace for another western custom: China on daylight
# time - sort of", Los Angeles Times, 1986-05-05 ... [says] that China began
# observing daylight saving time in 1986.
# From P Chan (2018-05-07):
# The start and end time of DST in China [from 1986 on] should be 2:00
# (i.e. 2:00 to 3:00 at the start and 2:00 to 1:00 at the end)....
# Government notices about summer time:
#
# 1986-04-12 http://www.zj.gov.cn/attach/zfgb/198608.pdf p.21-22
# (To establish summer time from 1986. On 4 May, set the clocks ahead one hour
# at 2 am. On 14 September, set the clocks backward one hour at 2 am.)
#
# 1987-02-15 http://www.gov.cn/gongbao/shuju/1987/gwyb198703.pdf p.114
# (Summer time in 1987 to start from 12 April until 13 September)
#
# 1987-09-09 http://www.gov.cn/gongbao/shuju/1987/gwyb198721.pdf p.709
# (From 1988, summer time to start from 2 am of the first Sunday of mid-April
# until 2 am of the first Sunday of mid-September)
#
# 1992-03-03 http://www.gov.cn/gongbao/shuju/1992/gwyb199205.pdf p.152
# (To suspend summer time from 1992)
#
# The first page of People's Daily on 12 April 1988 stating that summer time
# to begin on 17 April.
# http://data.people.com.cn/pic/101p/1988/04/1988041201.jpg
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule PRC 1986 only - May 4 2:00 1:00 D
Rule PRC 1986 1991 - Sep Sun>=11 2:00 0 S
Rule PRC 1987 1991 - Apr Sun>=11 2:00 1:00 D
# From Anthony Fok (2001-12-20):
# BTW, I did some research on-line and found some info regarding these five
# historic timezones from some Taiwan websites. And yes, there are official
# Chinese names for these locales (before 1949).
#
# From Jesper Nørgaard Welen (2006-07-14):
# I have investigated the timezones around 1970 on the
# https://www.astro.com/atlas site [with provinces and county
# boundaries summarized below].... A few other exceptions were two
# counties on the Sichuan side of the Xizang-Sichuan border,
# counties Dege and Baiyu which lies on the Sichuan side and are
# therefore supposed to be GMT+7, Xizang region being GMT+6, but Dege
# county is GMT+8 according to astro.com while Baiyu county is GMT+6
# (could be true), for the moment I am assuming that those two
# counties are mistakes in the astro.com data.
# From Paul Eggert (2017-01-05):
# Alois Treindl kindly sent me translations of the following two sources:
#
# (1)
# Guo Qing-sheng (National Time-Service Center, CAS, Xi'an 710600, China)
# Beijing Time at the Beginning of the PRC
# China Historical Materials of Science and Technology
# (Zhongguo ke ji shi liao, 中国科技史料). 2003;24(1):5-9.
# http://oversea.cnki.net/kcms/detail/detail.aspx?filename=ZGKS200301000&dbname=CJFD2003
# It gives evidence that at the beginning of the PRC, Beijing time was
# officially apparent solar time! However, Guo also says that the
# evidence is dubious, as the relevant institute of astronomy had not
# been taken over by the PRC yet. It's plausible that apparent solar
# time was announced but never implemented, and that people continued
# to use UT+8. As the Shanghai radio station (and I presume the
# observatory) was still under control of French missionaries, it
# could well have ignored any such mandate.
#
# (2)
# Guo Qing-sheng (Shaanxi Astronomical Observatory, CAS, Xi'an 710600, China)
# A Study on the Standard Time Changes for the Past 100 Years in China
# [undated and unknown publication location]
# It says several things:
# * The Qing dynasty used local apparent solar time throughout China.
# * The Republic of China instituted Beijing mean solar time effective
# the official calendar book of 1914.
# * The French Concession in Shanghai set up signal stations in
# French docks in the 1890s, controlled by Xujiahui (Zikawei)
# Observatory and set to local mean time.
# * "From the end of the 19th century" it changed to UT+8.
# * Chinese Customs (by then reduced to a tool of foreign powers)
# eventually standardized on this time for all ports, and it
# became used by railways as well.
# * In 1918 the Central Observatory proposed dividing China into
# five time zones (see below for details). This caught on
# at first only in coastal areas observing UT+8.
# * During WWII all of China was in theory was at UT+7. In practice
# this was ignored in the west, and I presume was ignored in
# Japanese-occupied territory.
# * Japanese-occupied Manchuria was at UT+9, i.e., Japan time.
# * The five-zone plan was resurrected after WWII and officially put into
# place (with some modifications) in March 1948. It's not clear
# how well it was observed in areas under Nationalist control.
# * The People's Liberation Army used UT+8 during the civil war.
#
# An AP article "Shanghai Internat'l Area Little Changed" in the
# Lewiston (ME) Daily Sun (1939-05-29), p 17, said "Even the time is
# different - the occupied districts going by Tokyo time, an hour
# ahead of that prevailing in the rest of Shanghai." Guess that the
# Xujiahui Observatory was under French control and stuck with UT +08.
#
# In earlier versions of this file, China had many separate Zone entries, but
# this was based on what were apparently incorrect data in Shanks & Pottenger.
# This has now been simplified to the two entries Asia/Shanghai and
# Asia/Urumqi, with the others being links for backward compatibility.
# Proposed in 1918 and theoretically in effect until 1949 (although in practice
# mainly observed in coastal areas), the five zones were:
#
# Changbai Time ("Long-white Time", Long-white = Heilongjiang area) UT +08:30
# Now part of Asia/Shanghai; its pre-1970 times are not recorded here.
# Heilongjiang (except Mohe county), Jilin
#
# Zhongyuan Time ("Central plain Time") UT +08
# Now part of Asia/Shanghai.
# most of China
# Milne gives 8:05:43.2 for Xujiahui Observatory time....
# Guo says Shanghai switched to UT +08 "from the end of the 19th century".
#
# Long-shu Time (probably as Long and Shu were two names of the area) UT +07
# Now part of Asia/Shanghai; its pre-1970 times are not recorded here.
# Guangxi, Guizhou, Hainan, Ningxia, Sichuan, Shaanxi, and Yunnan;
# most of Gansu; west Inner Mongolia; east Qinghai; and the Guangdong
# counties Deqing, Enping, Kaiping, Luoding, Taishan, Xinxing,
# Yangchun, Yangjiang, Yu'nan, and Yunfu.
#
# Xin-zang Time ("Xinjiang-Tibet Time") UT +06
# This region is now part of either Asia/Urumqi or Asia/Shanghai with
# current boundaries uncertain; times before 1970 for areas that
# disagree with Ürümqi or Shanghai are not recorded here.
# The Gansu counties Aksay, Anxi, Dunhuang, Subei; west Qinghai;
# the Guangdong counties Xuwen, Haikang, Suixi, Lianjiang,
# Zhanjiang, Wuchuan, Huazhou, Gaozhou, Maoming, Dianbai, and Xinyi;
# east Tibet, including Lhasa, Chamdo, Shigaise, Jimsar, Shawan and Hutubi;
# east Xinjiang, including Ürümqi, Turpan, Karamay, Korla, Minfeng, Jinghe,
# Wusu, Qiemo, Xinyan, Wulanwusu, Jinghe, Yumin, Tacheng, Tuoli, Emin,
# Shihezi, Changji, Yanqi, Heshuo, Tuokexun, Tulufan, Shanshan, Hami,
# Fukang, Kuitun, Kumukuli, Miquan, Qitai, and Turfan.
#
# Kunlun Time UT +05:30
# This region is now in the same status as Xin-zang Time (see above).
# West Tibet, including Pulan, Aheqi, Shufu, Shule;
# West Xinjiang, including Aksu, Atushi, Yining, Hetian, Cele, Luopu, Nileke,
# Zhaosu, Tekesi, Gongliu, Chabuchaer, Huocheng, Bole, Pishan, Suiding,
# and Yarkand.
# From Luther Ma (2009-10-17):
# Almost all (>99.9%) ethnic Chinese (properly ethnic Han) living in
# Xinjiang use Chinese Standard Time. Some are aware of Xinjiang time,
# but have no need of it. All planes, trains, and schools function on
# what is called "Beijing time." When Han make an appointment in Chinese
# they implicitly use Beijing time.
#
# On the other hand, ethnic Uyghurs, who make up about half the
# population of Xinjiang, typically use "Xinjiang time" which is two
# hours behind Beijing time, or UT +06. The government of the Xinjiang
# Uyghur Autonomous Region, (XAUR, or just Xinjiang for short) as well as
# local governments such as the Ürümqi city government use both times in
# publications, referring to what is popularly called Xinjiang time as
# "Ürümqi time." When Uyghurs make an appointment in the Uyghur language
# they almost invariably use Xinjiang time.
#
# (Their ethnic Han compatriots would typically have no clue of its
# widespread use, however, because so extremely few of them are fluent in
# Uyghur, comparable to the number of Anglo-Americans fluent in Navajo.)
#
# (...As with the rest of China there was a brief interval ending in 1990
# or 1991 when summer time was in use. The confusion was severe, with
# the province not having dual times but four times in use at the same
# time. Some areas remained on standard Xinjiang time or Beijing time and
# others moving their clocks ahead.)
# From Luther Ma (2009-11-19):
# With the risk of being redundant to previous answers these are the most common
# English "transliterations" (w/o using non-English symbols):
#
# 1. Wulumuqi...
# 2. Kashi...
# 3. Urumqi...
# 4. Kashgar...
# ...
# 5. It seems that Uyghurs in Ürümqi has been using Xinjiang since at least the
# 1960's. I know of one Han, now over 50, who grew up in the surrounding
# countryside and used Xinjiang time as a child.
#
# 6. Likewise for Kashgar and the rest of south Xinjiang I don't know of any
# start date for Xinjiang time.
#
# Without having access to local historical records, nor the ability to legally
# publish them, I would go with October 1, 1949, when Xinjiang became the Uyghur
# Autonomous Region under the PRC. (Before that Uyghurs, of course, would also
# not be using Beijing time, but some local time.)
# From David Cochrane (2014-03-26):
# Just a confirmation that Ürümqi time was implemented in Ürümqi on 1 Feb 1986:
# https://content.time.com/time/magazine/article/0,9171,960684,00.html
# From Luther Ma (2014-04-22):
# I have interviewed numerous people of various nationalities and from
# different localities in Xinjiang and can confirm the information in Guo's
# report regarding Xinjiang, as well as the Time article reference by David
# Cochrane. Whether officially recognized or not (and both are officially
# recognized), two separate times have been in use in Xinjiang since at least
# the Cultural Revolution: Xinjiang Time (XJT), aka Ürümqi Time or local time;
# and Beijing Time. There is no confusion in Xinjiang as to which name refers
# to which time. Both are widely used in the province, although in some
# population groups might be use one to the exclusion of the other. The only
# problem is that computers and smart phones list Ürümqi (or Kashgar) as
# having the same time as Beijing.
# From Paul Eggert (2014-06-30):
# In the early days of the PRC, Tibet was given its own time zone (UT +06)
# but this was withdrawn in 1959 and never reinstated; see Tubten Khétsun,
# Memories of life in Lhasa under Chinese Rule, Columbia U Press, ISBN
# 978-0231142861 (2008), translator's introduction by Matthew Akester, p x.
# As this is before our 1970 cutoff, Tibet doesn't need a separate zone.
#
# Xinjiang Time is well-documented as being officially recognized. E.g., see
# "The Working-Calendar for The Xinjiang Uygur Autonomous Region Government"
# (2014-04-22).
# Unfortunately, we have no good records of time in Xinjiang before 1986.
# During the 20th century parts of Xinjiang were ruled by the Qing dynasty,
# the Republic of China, various warlords, the First and Second East Turkestan
# Republics, the Soviet Union, the Kuomintang, and the People's Republic of
# China, and tracking down all these organizations' timekeeping rules would be
# quite a trick. Approximate this lost history by a transition from LMT to
# UT +06 at the start of 1928, the year of accession of the warlord Jin Shuren,
# which happens to be the date given by Shanks & Pottenger (no doubt as a
# guess) as the transition from LMT. Ignore the usage of +08 before
# 1986-02-01 under the theory that the transition date to +08 is unknown and
# that the sort of users who prefer Asia/Urumqi now typically ignored the
# +08 mandate back then.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
# Beijing time, used throughout China; represented by Shanghai.
#STDOFF 8:05:43.2
Zone Asia/Shanghai 8:05:43 - LMT 1901
8:00 Shang C%sT 1949 May 28
8:00 PRC C%sT
# Xinjiang time, used by many in western China; represented by Ürümqi / Ürümchi
# / Wulumuqi. (Please use Asia/Shanghai if you prefer Beijing time.)
# Vostok base in Antarctica matches this since 1970.
Zone Asia/Urumqi 5:50:20 - LMT 1928
6:00 - +06
# Hong Kong
# Milne gives 7:36:41.7.
# From Lee Yiu Chung (2009-10-24):
# I found there are some mistakes for the...DST rule for Hong
# Kong. [According] to the DST record from Hong Kong Observatory (actually,
# it is not [an] observatory, but the official meteorological agency of HK,
# and also serves as the official timing agency), there are some missing
# and incorrect rules. Although the exact switch over time is missing, I
# think 3:30 is correct.
# From Phake Nick (2018-10-27):
# According to Singaporean newspaper
# http://eresources.nlb.gov.sg/newspapers/Digitised/Article/singfreepresswk19041102-1.2.37
# the day that Hong Kong start using GMT+8 should be Oct 30, 1904.
#
# From Paul Eggert (2018-11-17):
# Hong Kong had a time ball near the Marine Police Station, Tsim Sha Tsui.
# "The ball was raised manually each day and dropped at exactly 1pm
# (except on Sundays and Government holidays)."
# Dyson AD. From Time Ball to Atomic Clock. Hong Kong Government. 1983.
#
# "From 1904 October 30 the time-ball at Hong Kong has been dropped by order
# of the Governor of the Colony at 17h 0m 0s G.M.T., which is 23m 18s.14 in
# advance of 1h 0m 0s of Hong Kong mean time."
# Hollis HP. Universal Time, Longitudes, and Geodesy. Mon Not R Astron Soc.
# 1905-02-10;65(4):405-6. https://doi.org/10.1093/mnras/65.4.382
#
# From Joseph Myers (2018-11-18):
# An astronomer before 1925 referring to GMT would have been using the old
# astronomical convention where the day started at noon, not midnight.
#
# From Steve Allen (2018-11-17):
# Meteorological Observations made at the Hongkong Observatory in the year 1904
# page 4
# ... the log of drop times in Table II shows that on Sunday 1904-10-30 the
# ball was dropped. So that looks like a special case drop for the sake
# of broadcasting the new local time.
#
# From Phake Nick (2018-11-18):
# According to The Hong Kong Weekly Press, 1904-10-29, p.324, the
# governor of Hong Kong at the time stated that "We are further desired to
# make it known that the change will be effected by firing the gun and by the
# dropping of the Ball at 23min. 18sec. before one."
# From Paul Eggert (2018-11-18):
# See for this; unfortunately Flash is required.
# From Phake Nick (2018-10-26):
# I went to check microfilm records stored at Hong Kong Public Library....
# on September 30 1941, according to Ta Kung Pao (Hong Kong edition), it was
# stated that fallback would occur on the next day (the 1st)'s "03:00 am (Hong
# Kong Time 04:00 am)" and the clock will fall back for a half hour. (03:00
# probably refer to the time commonly used in mainland China at the time given
# the paper's background) ... the sunrise/sunset time given by South China
# Morning Post for October 1st was indeed moved by half an hour compares to
# before. After that, in December, the battle to capture Hong Kong started and
# the library doesn't seems to have any record stored about press during that
# period of time. Some media resumed publication soon after that within the
# same month, but there were not much information about time there. Later they
# started including a radio program guide when they restored radio service,
# explicitly mentioning it use Tokyo standard time, and later added a note
# saying it's half an hour ahead of the old Hong Kong standard time, and it
# also seems to indicate that Hong Kong was not using GMT+8 when it was
# captured by Japan.
#
# Image of related sections on newspaper:
# * 1941-09-30, Ta Kung Pao (Hong Kong), "Winter Time start tomorrow".
# https://i.imgur.com/6waY51Z.jpg (Chinese)
# * 1941-09-29, South China Morning Post, Information on sunrise/sunset
# time and other things for September 30 and October 1.
# https://i.imgur.com/kCiUR78.jpg
# * 1942-02-05. The Hong Kong News, Radio Program Guide.
# https://i.imgur.com/eVvDMzS.jpg
# * 1941-06-14. Hong Kong Daily Press, Daylight Saving from 3am Tomorrow.
# https://i.imgur.com/05KkvtC.png
# * 1941-09-30, Hong Kong Daily Press, Winter Time Warning.
# https://i.imgur.com/dge4kFJ.png
# From Paul Eggert (2019-07-11):
# "Hong Kong winter time" is considered to be daylight saving.
# "Hong Kong had adopted daylight saving on June 15 as a wartime measure,
# clocks moving forward one hour until October 1, when they would be put back
# by just half an hour for 'Hong Kong Winter time', so that daylight saving
# operated year round." -- Low Z. The longest day: when wartime Hong Kong
# introduced daylight saving. South China Morning Post. 2019-06-28.
# https://www.scmp.com/magazines/post-magazine/short-reads/article/3016281/longest-day-when-wartime-hong-kong-introduced
# From P Chan (2018-12-31):
# * According to the Hong Kong Daylight-Saving Regulations, 1941, the
# 1941 spring-forward transition was at 03:00.
# http://sunzi.lib.hku.hk/hkgro/view/g1941/304271.pdf
# http://sunzi.lib.hku.hk/hkgro/view/g1941/305516.pdf
# * According to some articles from South China Morning Post, +08 was
# resumed on 1945-11-18 at 02:00.
# https://i.imgur.com/M2IsZ3c.png
# https://i.imgur.com/iOPqrVo.png
# https://i.imgur.com/fffcGDs.png
# * Some newspapers ... said the 1946 spring-forward transition was on
# 04-21 at 00:00. The Kung Sheung Evening News 1946-04-20 (Chinese)
# https://i.imgur.com/ZSzent0.png
# https://mmis.hkpl.gov.hk///c/portal/cover?c=QF757YsWv5%2FH7zGe%2FKF%2BFLYsuqGhRBfe p.4
# The Kung Sheung Daily News 1946-04-21 (Chinese)
# https://i.imgur.com/7ecmRlcm.png
# https://mmis.hkpl.gov.hk///c/portal/cover?c=QF757YsWv5%2BQBGt1%2BwUj5qG2GqtwR3Wh p.4
# * According to the Summer Time Ordinance (1946), the fallback
# transitions between 1946 and 1952 were at 03:30 Standard Time (+08)
# http://oelawhk.lib.hku.hk/archive/files/bb74b06a74d5294620a15de560ab33c6.pdf
# * Some other laws and regulations related to DST from 1953 to 1979
# Summer Time Ordinance 1953
# https://i.imgur.com/IOlJMav.jpg
# Summer Time (Amendment) Ordinance 1965
# https://i.imgur.com/8rofeLa.jpg
# Interpretation and General Clauses Ordinance (1966)
# https://i.imgur.com/joy3msj.jpg
# Emergency (Summer Time) Regulation 1973
# Interpretation and General Clauses (Amendment) Ordinance 1977
# https://i.imgur.com/RaNqnc4.jpg
# Resolution of the Legislative Council passed on 9 May 1979
# https://www.legco.gov.hk/yr78-79/english/lc_sitg/hansard/h790509.pdf#page=39
# From Paul Eggert (2020-04-15):
# Here are the dates given at
# https://www.hko.gov.hk/en/gts/time/Summertime.htm
# as of 2020-02-10:
# Year Period
# 1941 15 Jun to 30 Sep
# 1942 Whole year
# 1943 Whole year
# 1944 Whole year
# 1945 Whole year
# 1946 20 Apr to 1 Dec
# 1947 13 Apr to 30 Nov
# 1948 2 May to 31 Oct
# 1949 3 Apr to 30 Oct
# 1950 2 Apr to 29 Oct
# 1951 1 Apr to 28 Oct
# 1952 6 Apr to 2 Nov
# 1953 5 Apr to 1 Nov
# 1954 21 Mar to 31 Oct
# 1955 20 Mar to 6 Nov
# 1956 18 Mar to 4 Nov
# 1957 24 Mar to 3 Nov
# 1958 23 Mar to 2 Nov
# 1959 22 Mar to 1 Nov
# 1960 20 Mar to 6 Nov
# 1961 19 Mar to 5 Nov
# 1962 18 Mar to 4 Nov
# 1963 24 Mar to 3 Nov
# 1964 22 Mar to 1 Nov
# 1965 18 Apr to 17 Oct
# 1966 17 Apr to 16 Oct
# 1967 16 Apr to 22 Oct
# 1968 21 Apr to 20 Oct
# 1969 20 Apr to 19 Oct
# 1970 19 Apr to 18 Oct
# 1971 18 Apr to 17 Oct
# 1972 16 Apr to 22 Oct
# 1973 22 Apr to 21 Oct
# 1973/74 30 Dec 73 to 20 Oct 74
# 1975 20 Apr to 19 Oct
# 1976 18 Apr to 17 Oct
# 1977 Nil
# 1978 Nil
# 1979 13 May to 21 Oct
# 1980 to Now Nil
# The page does not give times of day for transitions,
# or dates for the 1942 and 1945 transitions.
# The Japanese occupation of Hong Kong began 1941-12-25.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule HK 1946 only - Apr 21 0:00 1:00 S
Rule HK 1946 only - Dec 1 3:30s 0 -
Rule HK 1947 only - Apr 13 3:30s 1:00 S
Rule HK 1947 only - Nov 30 3:30s 0 -
Rule HK 1948 only - May 2 3:30s 1:00 S
Rule HK 1948 1952 - Oct Sun>=28 3:30s 0 -
Rule HK 1949 1953 - Apr Sun>=1 3:30 1:00 S
Rule HK 1953 1964 - Oct Sun>=31 3:30 0 -
Rule HK 1954 1964 - Mar Sun>=18 3:30 1:00 S
Rule HK 1965 1976 - Apr Sun>=16 3:30 1:00 S
Rule HK 1965 1976 - Oct Sun>=16 3:30 0 -
Rule HK 1973 only - Dec 30 3:30 1:00 S
Rule HK 1979 only - May 13 3:30 1:00 S
Rule HK 1979 only - Oct 21 3:30 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
#STDOFF 7:36:41.7
Zone Asia/Hong_Kong 7:36:42 - LMT 1904 Oct 29 17:00u
8:00 - HKT 1941 Jun 15 3:00
8:00 1:00 HKST 1941 Oct 1 4:00
8:00 0:30 HKWT 1941 Dec 25
9:00 - JST 1945 Nov 18 2:00
8:00 HK HK%sT
###############################################################################
# Taiwan
# From smallufo (2010-04-03):
# According to Taiwan's CWB [Central Weather Bureau],
# http://www.cwb.gov.tw/V6/astronomy/cdata/summert.htm
# Taipei has DST in 1979 between July 1st and Sep 30.
# From Yu-Cheng Chuang (2013-07-12):
# On Dec 28, 1895, the Meiji Emperor announced Ordinance No. 167 of
# Meiji Year 28 "The clause about standard time", mentioned that
# Taiwan and Penghu Islands, as well as Yaeyama and Miyako Islands
# (both in Okinawa) adopt the Western Standard Time which is based on
# 120E. The adoption began from Jan 1, 1896. The original text can be
# found on Wikisource:
# https://ja.wikisource.org/wiki/標準時ニ關スル件_(公布時)
# ... This could be the first adoption of time zone in Taiwan, because
# during the Qing Dynasty, it seems that there was no time zone
# declared officially.
#
# Later, in the beginning of World War II, on Sep 25, 1937, the Showa
# Emperor announced Ordinance No. 529 of Showa Year 12 "The clause of
# revision in the ordinance No. 167 of Meiji year 28 about standard
# time", in which abolished the adoption of Western Standard Time in
# western islands (listed above), which means the whole Japan
# territory, including later occupations, adopt Japan Central Time
# (UT+9). The adoption began on Oct 1, 1937. The original text can
# be found on Wikisource:
# https://ja.wikisource.org/wiki/明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件
#
# That is, the time zone of Taipei switched to UT+9 on Oct 1, 1937.
# From Yu-Cheng Chuang (2014-07-02):
# I've found more evidence about when the time zone was switched from UT+9
# back to UT+8 after WW2. I believe it was on Sep 21, 1945. In a document
# during Japanese era [1] in which the officer told the staff to change time
# zone back to Western Standard Time (UT+8) on Sep 21. And in another
# history page of National Cheng Kung University [2], on Sep 21 there is a
# note "from today, switch back to Western Standard Time". From these two
# materials, I believe that the time zone change happened on Sep 21. And
# today I have found another monthly journal called "The Astronomical Herald"
# from The Astronomical Society of Japan [3] in which it mentioned the fact
# that:
#
# 1. Standard Time of the Country (Japan) was adopted on Jan 1, 1888, using
# the time at 135E (GMT+9)
#
# 2. Standard Time of the Country was renamed to Central Standard Time, on Jan
# 1, 1898, and on the same day, the new territories Taiwan and Penghu islands,
# as well as Yaeyama and Miyako islands, adopted a new time zone called
# Western Standard Time, which is in GMT+8.
#
# 3. Western Standard Time was deprecated on Sep 30, 1937. From then all the
# territories of Japan adopted the same time zone, which is Central Standard
# Time.
#
# [1] Academica Historica, Taiwan:
# http://163.29.208.22:8080/govsaleShowImage/connect_img.php?s=00101738900090036&e=00101738900090037
# [2] Nat'l Cheng Kung University 70th Anniversary Special Site:
# http://www.ncku.edu.tw/~ncku70/menu/001/01_01.htm
# [3] Yukio Niimi, The Standard Time in Japan (1997), p.475:
# http://www.asj.or.jp/geppou/archive_open/1997/pdf/19971001c.pdf
# Yu-Cheng Chuang (2014-07-03):
# I finally have found the real official gazette about changing back to
# Western Standard Time on Sep 21 in Taiwan. It's Taiwan Governor-General
# Bulletin No. 386 in Showa 20 years (1945), published on Sep 19, 1945. [1] ...
# [It] abolishes Bulletin No. 207 in Showa 12 years (1937), which is a local
# bulletin in Taiwan for that Ordinance No. 529. It also mentioned that 1am on
# Sep 21, 1945 will be 12am on Sep 21. I think this bulletin is much more
# official than the one I mentioned in my first mail, because it's from the
# top-level government in Taiwan. If you're going to quote any resource, this
# would be a good one.
# [1] Taiwan Governor-General Gazette, No. 1018, Sep 19, 1945:
# http://db2.th.gov.tw/db2/view/viewImg.php?imgcode=0072031018a&num=19&bgn=019&end=019&otherImg=&type=gener
# From Yu-Cheng Chuang (2014-07-02):
# In 1946, DST in Taiwan was from May 15 and ended on Sep 30. The info from
# Central Weather Bureau website was not correct.
#
# Original Bulletin:
# http://subtpg.tpg.gov.tw/og/image2.asp?f=03502F0AKM1AF
# http://subtpg.tpg.gov.tw/og/image2.asp?f=0350300AKM1B0 (cont.)
#
# In 1947, DST in Taiwan was expanded to Oct 31. There is a backup of that
# telegram announcement from Taiwan Province Government:
#
# http://subtpg.tpg.gov.tw/og/image2.asp?f=0360310AKZ431
#
# Here is a brief translation:
#
# The Summer Time this year is adopted from midnight Apr 15 until Sep 20
# midnight. To save (energy?) consumption, we're expanding Summer Time
# adoption till Oct 31 midnight.
#
# The Central Weather Bureau website didn't mention that, however it can
# be found from historical government announcement database.
# From Paul Eggert (2014-07-03):
# As per Yu-Cheng Chuang, say that Taiwan was at UT +09 from 1937-10-01
# until 1945-09-21 at 01:00, overriding Shanks & Pottenger.
# Likewise, use Yu-Cheng Chuang's data for DST in Taiwan.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Taiwan 1946 only - May 15 0:00 1:00 D
Rule Taiwan 1946 only - Oct 1 0:00 0 S
Rule Taiwan 1947 only - Apr 15 0:00 1:00 D
Rule Taiwan 1947 only - Nov 1 0:00 0 S
Rule Taiwan 1948 1951 - May 1 0:00 1:00 D
Rule Taiwan 1948 1951 - Oct 1 0:00 0 S
Rule Taiwan 1952 only - Mar 1 0:00 1:00 D
Rule Taiwan 1952 1954 - Nov 1 0:00 0 S
Rule Taiwan 1953 1959 - Apr 1 0:00 1:00 D
Rule Taiwan 1955 1961 - Oct 1 0:00 0 S
Rule Taiwan 1960 1961 - Jun 1 0:00 1:00 D
Rule Taiwan 1974 1975 - Apr 1 0:00 1:00 D
Rule Taiwan 1974 1975 - Oct 1 0:00 0 S
Rule Taiwan 1979 only - Jul 1 0:00 1:00 D
Rule Taiwan 1979 only - Oct 1 0:00 0 S
# Zone NAME STDOFF RULES FORMAT [UNTIL]
# Taipei or Taibei or T'ai-pei
Zone Asia/Taipei 8:06:00 - LMT 1896 Jan 1
8:00 - CST 1937 Oct 1
9:00 - JST 1945 Sep 21 1:00
8:00 Taiwan C%sT
# Macau (Macao, Aomen)
#
# From P Chan (2018-05-10):
# * LegisMac
# http://legismac.safp.gov.mo/legismac/descqry/Descqry.jsf?lang=pt
# A database for searching titles of legal documents of Macau in
# Chinese and Portuguese. The term "HORÁRIO DE VERÃO" can be used for
# searching decrees about summer time.
# * Archives of Macao
# http://www.archives.gov.mo/en/bo/
# It contains images of old official gazettes.
# * The Macao Meteorological and Geophysical Bureau have a page listing the
# summer time history. But it is not complete and has some mistakes.
# http://www.smg.gov.mo/smg/geophysics/e_t_Summer%20Time.htm
# Macau adopted GMT+8 on 30 Oct 1904 to follow Hong Kong. Clocks were
# advanced by 25 minutes and 50 seconds. Which means the LMT used was
# +7:34:10. As stated in the "Portaria No. 204" dated 21 October 1904
# and published in the Official Gazette on 29 October 1904.
# http://igallery.icm.gov.mo/Images/Archives/BO/MO_AH_PUB_BO_1904_10/MO_AH_PUB_BO_1904_10_00025_Grey.JPG
#
# Therefore the 1911 decree of Portugal did not change time in Macau.
#
# From LegisMac, here is a list of decrees that changed the time ...
# [Decree Gazette-no. date; titles omitted in this quotation]
# DIL 732 BOCM 51 1941.12.20
# DIL 764 BOCM 9S 1942.04.30
# DIL 781 BOCM 21 1942.10.10
# PT 3434 BOCM 8S 1943.04.17
# PT 3504 BOCM 20 1943.09.25
# PT 3843 BOCM 39 1945.09.29
# PT 3961 BOCM 17 1946.04.27
# PT 4026 BOCM 39 1946.09.28
# PT 4153 BOCM 16 1947.04.10
# PT 4271 BOCM 48 1947.11.29
# PT 4374 BOCM 18 1948.05.01
# PT 4465 BOCM 44 1948.10.30
# PT 4590 BOCM 14 1949.04.02
# PT 4666 BOCM 44 1949.10.29
# PT 4771 BOCM 12 1950.03.25
# PT 4838 BOCM 43 1950.10.28
# PT 4946 BOCM 12 1951.03.24
# PT 5025 BO 43 1951.10.27
# PT 5149 BO 14 1952.04.05
# PT 5251 BO 43 1952.10.25
# PT 5366 BO 13 1953.03.28
# PT 5444 BO 44 1953.10.31
# PT 5540 BO 12 1954.03.20
# PT 5589 BO 44 1954.10.30
# PT 5676 BO 12 1955.03.19
# PT 5739 BO 45 1955.11.05
# PT 5823 BO 11 1956.03.17
# PT 5891 BO 44 1956.11.03
# PT 5981 BO 12 1957.03.23
# PT 6064 BO 43 1957.10.26
# PT 6172 BO 12 1958.03.22
# PT 6243 BO 43 1958.10.25
# PT 6341 BO 12 1959.03.21
# PT 6411 BO 43 1959.10.24
# PT 6514 BO 11 1960.03.12
# PT 6584 BO 44 1960.10.29
# PT 6721 BO 10 1961.03.11
# PT 6815 BO 43 1961.10.28
# PT 6947 BO 10 1962.03.10
# PT 7080 BO 43 1962.10.27
# PT 7218 BO 12 1963.03.23
# PT 7340 BO 43 1963.10.26
# PT 7491 BO 11 1964.03.14
# PT 7664 BO 43 1964.10.24
# PT 7846 BO 15 1965.04.10
# PT 7979 BO 42 1965.10.16
# PT 8146 BO 15 1966.04.09
# PT 8252 BO 41 1966.10.08
# PT 8429 BO 15 1967.04.15
# PT 8540 BO 41 1967.10.14
# PT 8735 BO 15 1968.04.13
# PT 8860 BO 41 1968.10.12
# PT 9035 BO 16 1969.04.19
# PT 9156 BO 42 1969.10.18
# PT 9328 BO 15 1970.04.11
# PT 9418 BO 41 1970.10.10
# PT 9587 BO 14 1971.04.03
# PT 9702 BO 41 1971.10.09
# PT 38-A/72 BO 14 1972.04.01
# PT 126-A/72 BO 41 1972.10.07
# PT 61/73 BO 14 1973.04.07
# PT 182/73 BO 40 1973.10.06
# PT 282/73 BO 51 1973.12.22
# PT 177/74 BO 41 1974.10.12
# PT 51/75 BO 15 1975.04.12
# PT 173/75 BO 41 1975.10.11
# PT 67/76/M BO 14 1976.04.03
# PT 169/76/M BO 41 1976.10.09
# PT 78/79/M BO 19 1979.05.12
# PT 166/79/M BO 42 1979.10.20
# Note that DIL 732 does not belong to "HORÁRIO DE VERÃO" according to
# LegisMac.... Note that between 1942 and 1945, the time switched
# between GMT+9 and GMT+10. Also in 1965 and 1965 the DST ended at 2:30am.
# From Paul Eggert (2018-05-10):
# The 1904 decree says that Macau changed from the meridian of
# Fortaleza do Monte, presumably the basis for the 7:34:10 for LMT.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Macau 1942 1943 - Apr 30 23:00 1:00 -
Rule Macau 1942 only - Nov 17 23:00 0 -
Rule Macau 1943 only - Sep 30 23:00 0 S
Rule Macau 1946 only - Apr 30 23:00s 1:00 D
Rule Macau 1946 only - Sep 30 23:00s 0 S
Rule Macau 1947 only - Apr 19 23:00s 1:00 D
Rule Macau 1947 only - Nov 30 23:00s 0 S
Rule Macau 1948 only - May 2 23:00s 1:00 D
Rule Macau 1948 only - Oct 31 23:00s 0 S
Rule Macau 1949 1950 - Apr Sat>=1 23:00s 1:00 D
Rule Macau 1949 1950 - Oct lastSat 23:00s 0 S
Rule Macau 1951 only - Mar 31 23:00s 1:00 D
Rule Macau 1951 only - Oct 28 23:00s 0 S
Rule Macau 1952 1953 - Apr Sat>=1 23:00s 1:00 D
Rule Macau 1952 only - Nov 1 23:00s 0 S
Rule Macau 1953 1954 - Oct lastSat 23:00s 0 S
Rule Macau 1954 1956 - Mar Sat>=17 23:00s 1:00 D
Rule Macau 1955 only - Nov 5 23:00s 0 S
Rule Macau 1956 1964 - Nov Sun>=1 03:30 0 S
Rule Macau 1957 1964 - Mar Sun>=18 03:30 1:00 D
Rule Macau 1965 1973 - Apr Sun>=16 03:30 1:00 D
Rule Macau 1965 1966 - Oct Sun>=16 02:30 0 S
Rule Macau 1967 1976 - Oct Sun>=16 03:30 0 S
Rule Macau 1973 only - Dec 30 03:30 1:00 D
Rule Macau 1975 1976 - Apr Sun>=16 03:30 1:00 D
Rule Macau 1979 only - May 13 03:30 1:00 D
Rule Macau 1979 only - Oct Sun>=16 03:30 0 S
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Macau 7:34:10 - LMT 1904 Oct 30
8:00 - CST 1941 Dec 21 23:00
9:00 Macau +09/+10 1945 Sep 30 24:00
8:00 Macau C%sT
###############################################################################
# Cyprus
# Milne says the Eastern Telegraph Company used 2:14:00. Stick with LMT.
# IATA SSIM (1998-09) has Cyprus using EU rules for the first time.
# From Paul Eggert (2016-09-09):
# Yesterday's Cyprus Mail reports that Northern Cyprus followed Turkey's
# lead and switched from +02/+03 to +03 year-round.
# http://cyprus-mail.com/2016/09/08/two-time-zones-cyprus-turkey-will-not-turn-clocks-back-next-month/
#
# From Even Scharning (2016-10-31):
# Looks like the time zone split in Cyprus went through last night.
# http://cyprus-mail.com/2016/10/30/cyprus-new-division-two-time-zones-now-reality/
# From Paul Eggert (2017-10-18):
# Northern Cyprus will reinstate winter time on October 29, thus
# staying in sync with the rest of Cyprus. See: Anastasiou A.
# Cyprus to remain united in time. Cyprus Mail 2017-10-17.
# https://cyprus-mail.com/2017/10/17/cyprus-remain-united-time/
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Cyprus 1975 only - Apr 13 0:00 1:00 S
Rule Cyprus 1975 only - Oct 12 0:00 0 -
Rule Cyprus 1976 only - May 15 0:00 1:00 S
Rule Cyprus 1976 only - Oct 11 0:00 0 -
Rule Cyprus 1977 1980 - Apr Sun>=1 0:00 1:00 S
Rule Cyprus 1977 only - Sep 25 0:00 0 -
Rule Cyprus 1978 only - Oct 2 0:00 0 -
Rule Cyprus 1979 1997 - Sep lastSun 0:00 0 -
Rule Cyprus 1981 1998 - Mar lastSun 0:00 1:00 S
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Nicosia 2:13:28 - LMT 1921 Nov 14
2:00 Cyprus EE%sT 1998 Sep
2:00 EUAsia EE%sT
Zone Asia/Famagusta 2:15:48 - LMT 1921 Nov 14
2:00 Cyprus EE%sT 1998 Sep
2:00 EUAsia EE%sT 2016 Sep 8
3:00 - +03 2017 Oct 29 1:00u
2:00 EUAsia EE%sT
# Georgia
# From Paul Eggert (1994-11-19):
# Today's _Economist_ (p 60) reports that Georgia moved its clocks forward
# an hour recently, due to a law proposed by Zurab Murvanidze,
# an MP who went on a hunger strike for 11 days to force discussion about it!
# We have no details, but we'll guess they didn't move the clocks back in fall.
#
# From Mathew Englander, quoting AP (1996-10-23 13:05-04):
# Instead of putting back clocks at the end of October, Georgia
# will stay on daylight savings time this winter to save energy,
# President Eduard Shevardnadze decreed Wednesday.
#
# From the BBC via Joseph S. Myers (2004-06-27):
#
# Georgia moved closer to Western Europe on Sunday... The former Soviet
# republic has changed its time zone back to that of Moscow. As a result it
# is now just four hours ahead of Greenwich Mean Time, rather than five hours
# ahead. The switch was decreed by the pro-Western president of Georgia,
# Mikheil Saakashvili, who said the change was partly prompted by the process
# of integration into Europe.
# From Teimuraz Abashidze (2005-11-07):
# Government of Georgia ... decided to NOT CHANGE daylight savings time on
# [Oct.] 30, as it was done before during last more than 10 years.
# Currently, we are in fact GMT +4:00, as before 30 October it was GMT
# +3:00.... The problem is, there is NO FORMAL LAW or governmental document
# about it. As far as I can find, I was told, that there is no document,
# because we just DIDN'T ISSUE document about switching to winter time....
# I don't know what can be done, especially knowing that some years ago our
# DST rules where changed THREE TIMES during one month.
# Milne 1899 says Tbilisi (Tiflis) time was 2:59:05.7.
# Byalokoz 1919 says Georgia was 2:59:11.
# Go with Byalokoz.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Tbilisi 2:59:11 - LMT 1880
2:59:11 - TBMT 1924 May 2 # Tbilisi Mean Time
3:00 - +03 1957 Mar
4:00 RussiaAsia +04/+05 1991 Mar 31 2:00s
3:00 RussiaAsia +03/+04 1992
3:00 E-EurAsia +03/+04 1994 Sep lastSun
4:00 E-EurAsia +04/+05 1996 Oct lastSun
4:00 1:00 +05 1997 Mar lastSun
4:00 E-EurAsia +04/+05 2004 Jun 27
3:00 RussiaAsia +03/+04 2005 Mar lastSun 2:00
4:00 - +04
# East Timor
# See Indonesia for the 1945 transition.
# From João Carrascalão, brother of the former governor of East Timor, in
# East Timor may be late for its millennium
# (1999-12-26/31):
# Portugal tried to change the time forward in 1974 because the sun
# rises too early but the suggestion raised a lot of problems with the
# Timorese and I still don't think it would work today because it
# conflicts with their way of life.
# From Paul Eggert (2000-12-04):
# We don't have any record of the above attempt.
# Most likely our records are incomplete, but we have no better data.
# From Manoel de Almeida e Silva, Deputy Spokesman for the UN Secretary-General
# http://www.hri.org/news/world/undh/2000/00-08-16.undh.html
# (2000-08-16):
# The Cabinet of the East Timor Transition Administration decided
# today to advance East Timor's time by one hour. The time change,
# which will be permanent, with no seasonal adjustment, will happen at
# midnight on Saturday, September 16.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Dili 8:22:20 - LMT 1912 Jan 1
8:00 - +08 1942 Feb 21 23:00
9:00 - +09 1976 May 3
8:00 - +08 2000 Sep 17 0:00
9:00 - +09
# India
# British astronomer Henry Park Hollis disliked India Standard Time's offset:
# "A new time system has been proposed for India, Further India, and Burmah.
# The scheme suggested is that the times of the meridians 5½ and 6½ hours
# east of Greenwich should be adopted in these territories. No reason is
# given why hourly meridians five hours and six hours east should not be
# chosen; a plan which would bring the time of India into harmony with
# that of almost the whole of the civilised world."
# Hollis HP. Universal Time, Longitudes, and Geodesy. Mon Not R Astron Soc.
# 1905-02-10;65(4):405-6. https://doi.org/10.1093/mnras/65.4.382
# From Ian P. Beacock, in "A brief history of (modern) time", The Atlantic
# https://www.theatlantic.com/technology/archive/2015/12/the-creation-of-modern-time/421419/
# (2015-12-22):
# In January 1906, several thousand cotton-mill workers rioted on the
# outskirts of Bombay.... They were protesting the proposed abolition of
# local time in favor of Indian Standard Time.... Journalists called this
# dispute the "Battle of the Clocks." It lasted nearly half a century.
# From Paul Eggert (2017-04-20):
# Good luck trying to nail down old timekeeping records in India.
# "... in the nineteenth century ... Madras Observatory took its magnetic
# measurements on Göttingen time, its meteorological measurements on Madras
# (local) time, dropped its time ball on Greenwich (ocean navigator's) time,
# and distributed civil (local time)." -- Bartky IR. Selling the true time:
# 19th-century timekeeping in america. Stanford U Press (2000), 247 note 19.
# "A more potent cause of resistance to the general adoption of the present
# standard time lies in the fact that it is Madras time. The citizen of
# Bombay, proud of being 'primus in Indis' and of Calcutta, equally proud of
# his city being the Capital of India, and - for a part of the year - the Seat
# of the Supreme Government, alike look down on Madras, and refuse to change
# the time they are using, for that of what they regard as a benighted
# Presidency; while Madras, having for long given the standard time to the
# rest of India, would resist the adoption of any other Indian standard in its
# place." -- Oldham RD. On Time in India: a suggestion for its improvement.
# Proceedings of the Asiatic Society of Bengal (April 1899), 49-55.
#
# "In 1870 ... Madras time - 'now used by the telegraph and regulated from the
# only government observatory' - was suggested as a standard railway time,
# first to be adopted on the Great Indian Peninsular Railway (GIPR)....
# Calcutta, Bombay, and Karachi, were to be allowed to continue with their
# local time for civil purposes." - Prasad R. Tracks of Change: Railways and
# Everyday Life in Colonial India. Cambridge University Press (2016), 145.
#
# Reed S, Low F. The Indian Year Book 1936-37. Bennett, Coleman, pp 27-8.
# https://archive.org/details/in.ernet.dli.2015.282212
# This lists +052110 as Madras local time used in railways, and says that on
# 1906-01-01 railways and telegraphs in India switched to +0530. Some
# municipalities retained their former time, and the time in Calcutta
# continued to depend on whether you were at the railway station or at
# government offices. Government time was at +055320 (according to Shanks) or
# at +0554 (according to the Indian Year Book). Railway time is more
# appropriate for our purposes, as it was better documented, it is what we do
# elsewhere (e.g., Europe/London before 1880), and after 1906 it was
# consistent in the region now identified by Asia/Kolkata. So, use railway
# time for 1870-1941. Shanks is our only (and dubious) source for the
# 1941-1945 data.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Kolkata 5:53:28 - LMT 1854 Jun 28 # Kolkata
5:53:20 - HMT 1870 # Howrah Mean Time?
5:21:10 - MMT 1906 Jan 1 # Madras local time
5:30 - IST 1941 Oct
5:30 1:00 +0630 1942 May 15
5:30 - IST 1942 Sep
5:30 1:00 +0630 1945 Oct 15
5:30 - IST
# Since 1970 the following are like Asia/Kolkata:
# Andaman Is
# Lakshadweep (Laccadive, Minicoy and Amindivi Is)
# Nicobar Is
# Indonesia
#
# From Paul Eggert (2014-09-06):
# The 1876 Report of the Secretary of the [US] Navy, p 306 says that Batavia
# civil time was 7:07:12.5.
#
# From Gwillim Law (2001-05-28), overriding Shanks & Pottenger:
# http://www.sumatera-inc.com/go_to_invest/about_indonesia.asp#standtime
# says that Indonesia's time zones changed on 1988-01-01. Looking at some
# time zone maps, I think that must refer to Western Borneo (Kalimantan Barat
# and Kalimantan Tengah) switching from UTC+8 to UTC+7.
#
# From Paul Eggert (2007-03-10):
# Here is another correction to Shanks & Pottenger.
# JohnTWB writes that Japanese forces did not surrender control in
# Indonesia until 1945-09-01 00:00 at the earliest (in Jakarta) and
# other formal surrender ceremonies were September 9, 11, and 13, plus
# September 12 for the regional surrender to Mountbatten in Singapore.
# These would be the earliest possible times for a change.
# Régimes horaires pour le monde entier, by Henri Le Corre, (Éditions
# Traditionnelles, 1987, Paris) says that Java and Madura switched
# from UT +09 to +07:30 on 1945-09-23, and gives 1944-09-01 for Jayapura
# (Hollandia). For now, assume all Indonesian locations other than Jayapura
# switched on 1945-09-23.
#
# From Paul Eggert (2013-08-11):
# Normally the tz database uses English-language abbreviations, but in
# Indonesia it's typical to use Indonesian-language abbreviations even
# when writing in English. For example, see the English-language
# summary published by the Time and Frequency Laboratory of the
# Research Center for Calibration, Instrumentation and Metrology,
# Indonesia, (2006-09-29).
# The time zone abbreviations and UT offsets are:
#
# WIB - +07 - Waktu Indonesia Barat (Indonesia western time)
# WITA - +08 - Waktu Indonesia Tengah (Indonesia central time)
# WIT - +09 - Waktu Indonesia Timur (Indonesia eastern time)
#
# Zone NAME STDOFF RULES FORMAT [UNTIL]
# Java, Sumatra
#STDOFF 7:07:12.5
Zone Asia/Jakarta 7:07:12 - LMT 1867 Aug 10
# Shanks & Pottenger say the next transition was at 1924 Jan 1 0:13,
# but this must be a typo.
7:07:12 - BMT 1923 Dec 31 16:40u # Batavia
7:20 - +0720 1932 Nov
7:30 - +0730 1942 Mar 23
9:00 - +09 1945 Sep 23
7:30 - +0730 1948 May
8:00 - +08 1950 May
7:30 - +0730 1964
7:00 - WIB
# west and central Borneo
Zone Asia/Pontianak 7:17:20 - LMT 1908 May
7:17:20 - PMT 1932 Nov # Pontianak MT
7:30 - +0730 1942 Jan 29
9:00 - +09 1945 Sep 23
7:30 - +0730 1948 May
8:00 - +08 1950 May
7:30 - +0730 1964
8:00 - WITA 1988 Jan 1
7:00 - WIB
# Sulawesi, Lesser Sundas, east and south Borneo
Zone Asia/Makassar 7:57:36 - LMT 1920
7:57:36 - MMT 1932 Nov # Macassar MT
8:00 - +08 1942 Feb 9
9:00 - +09 1945 Sep 23
8:00 - WITA
# Maluku Islands, West Papua, Papua
Zone Asia/Jayapura 9:22:48 - LMT 1932 Nov
9:00 - +09 1944 Sep 1
9:30 - +0930 1964
9:00 - WIT
# Iran
# From Roozbeh Pournader (2022-05-30):
# Here's an order from the Cabinet to the rest of the government to switch to
# Tehran time, which is mentioned to be already at +03:30:
# https://qavanin.ir/Law/TreeText/180138
# Just in case that goes away, I also saved a copy at archive.org:
# https://web.archive.org/web/20220530111940/https://qavanin.ir/Law/TreeText/180138
# Here's my translation:
#
# "Circular on Matching the Hours of Governmental and Official Circles
# in Provinces
# Approved 1314/03/22 [=1935-06-13]
# According to the ruling of the Honorable Cabinet, it is ordered that from
# now on in all internal provinces of the country, governmental and official
# circles set their time to match Tehran time (three hours and half before
# Greenwich)....
#
# I still haven't found out when Tehran itself switched to +03:30....
#
# From Paul Eggert (2022-06-05):
# Although the above says Tehran was at +03:30 before 1935-06-13, we don't
# know when it switched to +03:30. For now, use 1935-06-13 as the switch date.
# Although most likely wrong, we have no better info.
# From Roozbeh Pournader (2022-06-01):
# This is from Kayhan newspaper, one of the major Iranian newspapers, from
# March 20, 1978, page 2:
#
# "Pull the clocks 60 minutes forward
# As we informed before, from the fourth day of the month Farvardin of the
# new year [=1978-03-24], clocks will be pulled forward, and people's daily
# work and life program will start one hour earlier than the current program.
# On the 1st day of the month Farvardin of this year [=1977-03-21], they had
# pulled the clocks forward by one hour, but in the month of Mehr
# [=1977-09-23], the clocks were pulled back by 30 minutes.
# In this way, from the 4th day of the month Farvardin, clocks will be ahead
# of the previous years by one hour and a half.
# According to the new program, during the night of 4th of Farvardin, when
# the midnight, meaning 24 o'clock is announced, the hands of the clock must
# be pulled forward by one hour and thus consider midnight 1 o'clock in the
# forenoon."
#
# This implies that in September 1977, when the daylight savings time was
# done with, Iran didn't go back to +03:30, but immediately to +04:00.
#
#
# This is from the major Iranian newspaper Ettela'at, dated [1978-08-03]...,
# page 32. It looks like they decided to get the clocks back to +4:00
# just in time for Ramadan that year:
#
# "Tomorrow Night, Pull the Clocks Back by One Hour
# At 1 o'clock in the forenoon of Saturday 14 Mordad [=1978-08-05], the
# clocks will be pulled one hour back and instead of 1 o'clock in the
# forenoon, Radio Iran will announce 24 o'clock.
# This decision was made in the Cabinet of Ministers meeting of 25 Tir
# [=1978-07-16], [...]
# At the beginning of the year 2537 [=March 1978: Iran was using a different
# year number for a few years then, based on the Coronation of Cyrus the
# Great], the country's official time was pulled forward by one hour and now
# the official time is one hour and a half ahead compared to last year,
# because in Farvardin of last year [=March 1977], the official time was
# pulled forward one hour and this continued until the second half of last
# year [=September 1977] until in the second half of last year the official
# time was pulled back half an hour and that half hour still remains."
#
# This matches the time of the true noon published in the newspapers, as they
# clearly go from +05:00 to +04:00 after that date (which happened during a
# long weekend in Iran).
# From Roozbeh Pournader (2022-05-31):
# [Movahedi S. Cultural preconceptions of time: Can we use operational time
# to meddle in God's Time? Comp Stud Soc Hist. 1985;27(3):385-400]
# https://www.jstor.org/stable/178704
# Here's the quotes from the paper:
# 1. '"Iran's official time keeper moved the clock one hour forward as from
# March 22, 1977 (Farvardin 2, 2536) to make maximum use of daylight and save
# in energy consumption. Thus Iran joined such other countries as Britain in
# observing what is known as 'daylight saving.' The proposal was originally
# put forward by the Ministry of Energy, in no way having any influence on
# observing religious ceremonies. Moving time one hour forward in summer
# means that at 11:00 o'clock on March 21, the official time was set as
# midnight March 22. Then September 24 will actually begin one hour later
# than the end of September 23 [...]." Iran's time base thus continued to be
# Greenwich Mean Time plus three and one-half hours (plus four and one-half
# hours in summer).'
#
# The article sources this from Iran Almanac and Book of Facts, 1977, Tehran:
# Echo of Iran, which is on Google Books at
# https://www.google.com/books/edition/Iran_Almanac_and_Book_of_Facts/9ybVAAAAMAAJ.
# (I confirmed it by searching for snippets.)
#
# 2. "After the fall of the shah, the revolutionary government returned to
# daylight-saving time (DST) on 26 May 1979."
#
# This seems to have been announced just one day in advance, on 25 May 1979.
#
# The change in 1977 clearly seems to be the first daylight savings effort in
# Iran. But the article doesn't mention what happened in 1978 (which was
# still during the shah's government), or how things continued in 1979
# onwards (which was during the Islamic Republic).
# From Francis Santoni (2022-06-01):
# for Iran and 1977 the effective change is only 20 October
# (UIT No. 143 17.XI.1977) and not 23 September (UIT No. 141 13.IX.1977).
# UIT is the Operational Bulletin of International Telecommunication Union.
# From Roozbeh Pournader (2003-03-15):
# This is an English translation of what I just found (originally in Persian).
# The Gregorian dates in brackets are mine:
#
# Official Newspaper No. 13548-1370/6/25 [1991-09-16]
# No. 16760/T233 H 1370/6/10 [1991-09-01]
#
# The Rule About Change of the Official Time of the Country
#
# The Board of Ministers, in the meeting dated 1370/5/23 [1991-08-14],
# based on the suggestion number 2221/D dated 1370/4/22 [1991-07-13]
# of the Country's Organization for Official and Employment Affairs,
# and referring to the law for equating the working hours of workers
# and officers in the whole country dated 1359/4/23 [1980-07-14], and
# for synchronizing the official times of the country, agreed that:
#
# The official time of the country will should move forward one hour
# at the 24[:00] hours of the first day of Farvardin and should return
# to its previous state at the 24[:00] hours of the 30th day of
# Shahrivar.
#
# First Deputy to the President - Hassan Habibi
#
# From personal experience, that agrees with what has been followed
# for at least the last 5 years. Before that, for a few years, the
# date used was the first Thursday night of Farvardin and the last
# Thursday night of Shahrivar, but I can't give exact dates....
#
# From Roozbeh Pournader (2005-04-05):
# The text of the Iranian law, in effect since 1925, clearly mentions
# that the true solar year is the measure, and there is no arithmetic
# leap year calculation involved. There has never been any serious
# plan to change that law....
#
# From Paul Eggert (2022-06-30):
# Go with Pournader for 1935 through spring 1979, and for timestamps
# after August 1991; go with with Shanks & Pottenger for other timestamps.
# Go with Santoni's citation of the UIT for fall 1977, as 20 October 1977
# is 28 Mehr 1356, consistent with the "Mehr" in Pournader's source.
# Assume that the UIT's "1930" is UTC, i.e., 24:00 local time.
#
# From Oscar van Vlijmen (2005-03-30), writing about future
# discrepancies between cal-persia and the Iranian calendar:
# For 2091 solar-longitude-after yields 2091-03-20 08:40:07.7 UT for
# the vernal equinox and that gets so close to 12:00 some local
# Iranian time that the definition of the correct location needs to be
# known exactly, amongst other factors. 2157 is even closer:
# 2157-03-20 08:37:15.5 UT. But the Gregorian year 2025 should give
# no interpretation problem whatsoever. By the way, another instant
# in the near future where there will be a discrepancy between
# arithmetical and astronomical Iranian calendars will be in 2058:
# vernal equinox on 2058-03-20 09:03:05.9 UT. The Java version of
# Reingold's/Dershowitz' calculator gives correctly the Gregorian date
# 2058-03-21 for 1 Farvardin 1437 (astronomical).
#
# From Steffen Thorsen (2006-03-22):
# Several of my users have reported that Iran will not observe DST anymore:
# http://www.irna.ir/en/news/view/line-17/0603193812164948.htm
#
# From Reuters (2007-09-16), with a heads-up from Jesper Nørgaard Welen:
# ... the Guardian Council ... approved a law on Sunday to re-introduce
# daylight saving time ...
# https://uk.reuters.com/article/oilRpt/idUKBLA65048420070916
#
# From Roozbeh Pournader (2007-11-05):
# This is quoted from Official Gazette of the Islamic Republic of
# Iran, Volume 63, No. 18242, dated Tuesday 1386/6/24
# [2007-10-16]. I am doing the best translation I can:...
# The official time of the country will be moved forward for one hour
# on the 24 hours of the first day of the month of Farvardin and will
# be changed back to its previous state on the 24 hours of the
# thirtieth day of Shahrivar.
#
# From Ali Mirjamali (2022-05-10):
# Official IR News Agency announcement: irna.ir/xjJ3TT
# ...
# Highlights: DST will be cancelled for the next Iranian year 1402
# (i.e 2023-March-21) and forthcoming years.
#
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
# Work around a bug in zic 2022a and earlier.
Rule Iran 1910 only - Jan 1 00:00 0 -
#
Rule Iran 1977 only - Mar 21 23:00 1:00 -
Rule Iran 1977 only - Oct 20 24:00 0 -
Rule Iran 1978 only - Mar 24 24:00 1:00 -
Rule Iran 1978 only - Aug 5 01:00 0 -
Rule Iran 1979 only - May 26 24:00 1:00 -
Rule Iran 1979 only - Sep 18 24:00 0 -
Rule Iran 1980 only - Mar 20 24:00 1:00 -
Rule Iran 1980 only - Sep 22 24:00 0 -
Rule Iran 1991 only - May 2 24:00 1:00 -
Rule Iran 1992 1995 - Mar 21 24:00 1:00 -
Rule Iran 1991 1995 - Sep 21 24:00 0 -
Rule Iran 1996 only - Mar 20 24:00 1:00 -
Rule Iran 1996 only - Sep 20 24:00 0 -
Rule Iran 1997 1999 - Mar 21 24:00 1:00 -
Rule Iran 1997 1999 - Sep 21 24:00 0 -
Rule Iran 2000 only - Mar 20 24:00 1:00 -
Rule Iran 2000 only - Sep 20 24:00 0 -
Rule Iran 2001 2003 - Mar 21 24:00 1:00 -
Rule Iran 2001 2003 - Sep 21 24:00 0 -
Rule Iran 2004 only - Mar 20 24:00 1:00 -
Rule Iran 2004 only - Sep 20 24:00 0 -
Rule Iran 2005 only - Mar 21 24:00 1:00 -
Rule Iran 2005 only - Sep 21 24:00 0 -
Rule Iran 2008 only - Mar 20 24:00 1:00 -
Rule Iran 2008 only - Sep 20 24:00 0 -
Rule Iran 2009 2011 - Mar 21 24:00 1:00 -
Rule Iran 2009 2011 - Sep 21 24:00 0 -
Rule Iran 2012 only - Mar 20 24:00 1:00 -
Rule Iran 2012 only - Sep 20 24:00 0 -
Rule Iran 2013 2015 - Mar 21 24:00 1:00 -
Rule Iran 2013 2015 - Sep 21 24:00 0 -
Rule Iran 2016 only - Mar 20 24:00 1:00 -
Rule Iran 2016 only - Sep 20 24:00 0 -
Rule Iran 2017 2019 - Mar 21 24:00 1:00 -
Rule Iran 2017 2019 - Sep 21 24:00 0 -
Rule Iran 2020 only - Mar 20 24:00 1:00 -
Rule Iran 2020 only - Sep 20 24:00 0 -
Rule Iran 2021 2022 - Mar 21 24:00 1:00 -
Rule Iran 2021 2022 - Sep 21 24:00 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Tehran 3:25:44 - LMT 1916
3:25:44 - TMT 1935 Jun 13 # Tehran Mean Time
3:30 Iran +0330/+0430 1977 Oct 20 24:00
4:00 Iran +04/+05 1979
3:30 Iran +0330/+0430
# Iraq
#
# From Jonathan Lennox (2000-06-12):
# An article in this week's Economist ("Inside the Saddam-free zone", p. 50 in
# the U.S. edition) on the Iraqi Kurds contains a paragraph:
# "The three northern provinces ... switched their clocks this spring and
# are an hour ahead of Baghdad."
#
# But Rives McDow (2000-06-18) quotes a contact in Iraqi-Kurdistan as follows:
# In the past, some Kurdish nationalists, as a protest to the Iraqi
# Government, did not adhere to daylight saving time. They referred
# to daylight saving as Saddam time. But, as of today, the time zone
# in Iraqi-Kurdistan is on standard time with Baghdad, Iraq.
#
# So we'll ignore the Economist's claim.
# From Steffen Thorsen (2008-03-10):
# The cabinet in Iraq abolished DST last week, according to the following
# news sources (in Arabic):
# http://www.aljeeran.net/wesima_articles/news-20080305-98602.html
# http://www.aswataliraq.info/look/article.tpl?id=2047&IdLanguage=17&IdPublication=4&NrArticle=71743&NrIssue=1&NrSection=10
#
# We have published a short article in English about the change:
# https://www.timeanddate.com/news/time/iraq-dumps-daylight-saving.html
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Iraq 1982 only - May 1 0:00 1:00 -
Rule Iraq 1982 1984 - Oct 1 0:00 0 -
Rule Iraq 1983 only - Mar 31 0:00 1:00 -
Rule Iraq 1984 1985 - Apr 1 0:00 1:00 -
Rule Iraq 1985 1990 - Sep lastSun 1:00s 0 -
Rule Iraq 1986 1990 - Mar lastSun 1:00s 1:00 -
# IATA SSIM (1991/1996) says Apr 1 12:01am UTC; guess the ':01' is a typo.
# Shanks & Pottenger say Iraq did not observe DST 1992/1997; ignore this.
#
Rule Iraq 1991 2007 - Apr 1 3:00s 1:00 -
Rule Iraq 1991 2007 - Oct 1 3:00s 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Baghdad 2:57:40 - LMT 1890
2:57:36 - BMT 1918 # Baghdad Mean Time?
3:00 - +03 1982 May
3:00 Iraq +03/+04
###############################################################################
# Israel
# For more info about the motivation for DST in Israel, see:
# Barak Y. Israel's Daylight Saving Time controversy. Israel Affairs.
# 2020-08-11. https://doi.org/10.1080/13537121.2020.1806564
# From Ephraim Silverberg (2001-01-11):
#
# I coined "IST/IDT" circa 1988. Until then there were three
# different abbreviations in use:
#
# JST Jerusalem Standard Time [Danny Braniss, Hebrew University]
# IZT Israel Zonal (sic) Time [Prof. Haim Papo, Technion]
# EEST Eastern Europe Standard Time [used by almost everyone else]
#
# Since timezones should be called by country and not capital cities,
# I ruled out JST. As Israel is in Asia Minor and not Eastern Europe,
# EEST was equally unacceptable. Since "zonal" was not compatible with
# any other timezone abbreviation, I felt that 'IST' was the way to go
# and, indeed, it has received almost universal acceptance in timezone
# settings in Israeli computers.
#
# In any case, I am happy to share timezone abbreviations with India,
# high on my favorite-country list (and not only because my wife's
# family is from India).
# From P Chan (2020-10-27), with corrections:
#
# 1940-1946 Supplement No. 2 to the Palestine Gazette
# # issue page Order No. dated start end note
# 1 1010 729 67 of 1940 1940-05-22 1940-05-31* 1940-09-30* revoked by #2
# 2 1013 758 73 of 1940 1940-05-31 1940-05-31 1940-09-30
# 3 1055 1574 196 of 1940 1940-11-06 1940-11-16 1940-12-31
# 4 1066 1811 208 of 1940 1940-12-17 1940-12-31 1941-12-31
# 5 1156 1967 116 of 1941 1941-12-16 1941-12-31 1942-12-31* amended by #6
# 6 1228 1608 86 of 1942 1942-10-14 1941-12-31 1942-10-31
# 7 1256 279 21 of 1943 1943-03-18 1943-03-31 1943-10-31
# 8 1323 249 19 of 1944 1944-03-13 1944-03-31 1944-10-31
# 9 1402 328 20 of 1945 1945-04-05 1945-04-15 1945-10-31
#10 1487 596 14 of 1946 1946-04-04 1946-04-15 1946-10-31
#
# 1948 Iton Rishmi (Official Gazette of the Provisional Government)
# # issue page dated start end
#11 2 7 1948-05-20 1948-05-22 1948-10-31*
# ^This moved timezone to +04, replaced by #12 from 1948-08-31 24:00 GMT.
#12 17 (Annex B) 84 1948-08-22 1948-08-31 1948-10-31
#
# 1949-2000 Kovetz HaTakanot (Collection of Regulations)
# # issue page dated start end note
#13 6 133 1949-03-23 1949-04-30 1949-10-31
#14 80 755 1950-03-17 1950-04-15 1950-09-14
#15 164 782 1951-03-22 1951-03-31 1951-09-29* amended by #16
#16 206 1940 1951-09-23 ---------- 1951-10-22* amended by #17
#17 212 78 1951-10-19 ---------- 1951-11-10
#18 254 652 1952-03-03 1952-04-19 1952-09-27* amended by #19
#19 300 11 1952-09-15 ---------- 1952-10-18
#20 348 817 1953-03-03 1953-04-11 1953-09-12
#21 420 385 1954-02-17 1954-06-12 1954-09-11
#22 497 548 1955-01-14 1955-06-11 1955-09-10
#23 591 608 1956-03-12 1956-06-02 1956-09-29
#24 680 957 1957-02-08 1957-04-27 1957-09-21
#25 3192 1418 1974-06-28 1974-07-06 1974-10-12
#26 3322 1389 1975-04-03 1975-04-19 1975-08-30
#27 4146 2089 1980-07-15 1980-08-02 1980-09-13
#28 4604 1081 1984-02-22 1984-05-05* 1984-08-25* revoked by #29
#29 4619 1312 1984-04-06 1984-05-05 1984-08-25
#30 4744 475 1984-12-23 1985-04-13 1985-09-14* amended by #31
#31 4851 1848 1985-08-18 ---------- 1985-08-31
#32 4932 899 1986-04-22 1986-05-17 1986-09-06
#33 5013 580 1987-02-15 1987-04-18* 1987-08-22* revoked by #34
#34 5021 744 1987-03-30 1987-04-14 1987-09-12
#35 5096 659 1988-02-14 1988-04-09 1988-09-03
#36 5167 514 1989-02-03 1989-04-29 1989-09-02
#37 5248 375 1990-01-23 1990-03-24 1990-08-25
#38 5335 612 1991-02-10 1991-03-09* 1991-08-31 amended by #39
# 1992-03-28 1992-09-05
#39 5339 709 1991-03-04 1991-03-23 ----------
#40 5506 503 1993-02-18 1993-04-02 1993-09-05
# 1994-04-01 1994-08-28
# 1995-03-31 1995-09-03
#41 5731 438 1996-01-01 1996-03-14 1996-09-15
# 1997-03-13* 1997-09-18* overridden by 1997 Temp Prov
# 1998-03-19* 1998-09-17* revoked by #42
#42 5853 1243 1997-09-18 1998-03-19 1998-09-05
#43 5937 77 1998-10-18 1999-04-02 1999-09-03
# 2000-04-14* 2000-09-15* revoked by #44
# 2001-04-13* 2001-09-14* revoked by #44
#44 6024 39 2000-03-14 2000-04-14 2000-10-22* overridden by 2000 Temp Prov
# 2001-04-06* 2001-10-10* overridden by 2000 Temp Prov
# 2002-03-29* 2002-10-29* overridden by 2000 Temp Prov
#
# These are laws enacted by the Knesset since the Minister could only alter the
# transition dates at least six months in advanced under the 1992 Law.
# dated start end
# 1997 Temporary Provisions 1997-03-06 1997-03-20 1997-09-13
# 2000 Temporary Provisions 2000-07-28 ---------- 2000-10-06
# 2001-04-09 2001-09-24
# 2002-03-29 2002-10-07
# 2003-03-28 2003-10-03
# 2004-04-07 2004-09-22
# Note:
# Transition times in 1940-1957 (#1-#24) were midnight GMT,
# in 1974-1998 (#25-#42 and the 1997 Temporary Provisions) were midnight,
# in 1999-April 2000 (#43,#44) were 02:00,
# in the 2000 Temporary Provisions were 01:00.
#
# -----------------------------------------------------------------------------
# Links:
# 1 https://findit.library.yale.edu/images_layout/view?parentoid=15537490&increment=687
# 2 https://findit.library.yale.edu/images_layout/view?parentoid=15537490&increment=716
# 3 https://findit.library.yale.edu/images_layout/view?parentoid=15537491&increment=721
# 4 https://findit.library.yale.edu/images_layout/view?parentoid=15537491&increment=958
# 5 https://findit.library.yale.edu/images_layout/view?parentoid=15537502&increment=558
# 6 https://findit.library.yale.edu/images_layout/view?parentoid=15537511&increment=105
# 7 https://findit.library.yale.edu/images_layout/view?parentoid=15537516&increment=278
# 8 https://findit.library.yale.edu/images_layout/view?parentoid=15537522&increment=248
# 9 https://findit.library.yale.edu/images_layout/view?parentoid=15537530&increment=329
#10 https://findit.library.yale.edu/images_layout/view?parentoid=15537537&increment=601
#11 https://www.nevo.co.il/law_word/law12/er-002.pdf#page=3
#12 https://www.nevo.co.il/law_word/law12/er-017-t2.pdf#page=4
#13 https://www.nevo.co.il/law_word/law06/tak-0006.pdf#page=3
#14 https://www.nevo.co.il/law_word/law06/tak-0080.pdf#page=7
#15 https://www.nevo.co.il/law_word/law06/tak-0164.pdf#page=10
#16 https://www.nevo.co.il/law_word/law06/tak-0206.pdf#page=4
#17 https://www.nevo.co.il/law_word/law06/tak-0212.pdf#page=2
#18 https://www.nevo.co.il/law_word/law06/tak-0254.pdf#page=4
#19 https://www.nevo.co.il/law_word/law06/tak-0300.pdf#page=5
#20 https://www.nevo.co.il/law_word/law06/tak-0348.pdf#page=3
#21 https://www.nevo.co.il/law_word/law06/tak-0420.pdf#page=5
#22 https://www.nevo.co.il/law_word/law06/tak-0497.pdf#page=10
#23 https://www.nevo.co.il/law_word/law06/tak-0591.pdf#page=6
#24 https://www.nevo.co.il/law_word/law06/tak-0680.pdf#page=3
#25 https://www.nevo.co.il/law_word/law06/tak-3192.pdf#page=2
#26 https://www.nevo.co.il/law_word/law06/tak-3322.pdf#page=5
#27 https://www.nevo.co.il/law_word/law06/tak-4146.pdf#page=2
#28 https://www.nevo.co.il/law_word/law06/tak-4604.pdf#page=7
#29 https://www.nevo.co.il/law_word/law06/tak-4619.pdf#page=2
#30 https://www.nevo.co.il/law_word/law06/tak-4744.pdf#page=11
#31 https://www.nevo.co.il/law_word/law06/tak-4851.pdf#page=2
#32 https://www.nevo.co.il/law_word/law06/tak-4932.pdf#page=19
#33 https://www.nevo.co.il/law_word/law06/tak-5013.pdf#page=8
#34 https://www.nevo.co.il/law_word/law06/tak-5021.pdf#page=8
#35 https://www.nevo.co.il/law_word/law06/tak-5096.pdf#page=3
#36 https://www.nevo.co.il/law_word/law06/tak-5167.pdf#page=2
#37 https://www.nevo.co.il/law_word/law06/tak-5248.pdf#page=7
#38 https://www.nevo.co.il/law_word/law06/tak-5335.pdf#page=6
#39 https://www.nevo.co.il/law_word/law06/tak-5339.pdf#page=7
#40 https://www.nevo.co.il/law_word/law06/tak-5506.pdf#page=19
#41 https://www.nevo.co.il/law_word/law06/tak-5731.pdf#page=2
#42 https://www.nevo.co.il/law_word/law06/tak-5853.pdf#page=3
#43 https://www.nevo.co.il/law_word/law06/tak-5937.pdf#page=9
#44 https://www.nevo.co.il/law_word/law06/tak-6024.pdf#page=4
#
# Time Determination (Temporary Provisions) Law, 1997
# https://www.nevo.co.il/law_html/law19/p201_003.htm
#
# Time Determination (Temporary Provisions) Law, 2000
# https://www.nevo.co.il/law_html/law19/p201_004.htm
#
# Time Determination Law, 1992 and amendments
# https://www.nevo.co.il/law_html/law01/p201_002.htm
# https://main.knesset.gov.il/Activity/Legislation/Laws/Pages/LawPrimary.aspx?lawitemid=2001174
# From Paul Eggert (2020-10-27):
# Several of the midnight transitions mentioned above are ambiguous;
# are they 00:00, 00:00s, 24:00, or 24:00s? When resolving these ambiguities,
# try to minimize changes from previous tzdb versions, for lack of better info.
# Commentary from previous versions is included below, to help explain this.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Zion 1940 only - May 31 24:00u 1:00 D
Rule Zion 1940 only - Sep 30 24:00u 0 S
Rule Zion 1940 only - Nov 16 24:00u 1:00 D
Rule Zion 1942 1946 - Oct 31 24:00u 0 S
Rule Zion 1943 1944 - Mar 31 24:00u 1:00 D
Rule Zion 1945 1946 - Apr 15 24:00u 1:00 D
Rule Zion 1948 only - May 22 24:00u 2:00 DD
Rule Zion 1948 only - Aug 31 24:00u 1:00 D
Rule Zion 1948 1949 - Oct 31 24:00u 0 S
Rule Zion 1949 only - Apr 30 24:00u 1:00 D
Rule Zion 1950 only - Apr 15 24:00u 1:00 D
Rule Zion 1950 only - Sep 14 24:00u 0 S
Rule Zion 1951 only - Mar 31 24:00u 1:00 D
Rule Zion 1951 only - Nov 10 24:00u 0 S
Rule Zion 1952 only - Apr 19 24:00u 1:00 D
Rule Zion 1952 only - Oct 18 24:00u 0 S
Rule Zion 1953 only - Apr 11 24:00u 1:00 D
Rule Zion 1953 only - Sep 12 24:00u 0 S
Rule Zion 1954 only - Jun 12 24:00u 1:00 D
Rule Zion 1954 only - Sep 11 24:00u 0 S
Rule Zion 1955 only - Jun 11 24:00u 1:00 D
Rule Zion 1955 only - Sep 10 24:00u 0 S
Rule Zion 1956 only - Jun 2 24:00u 1:00 D
Rule Zion 1956 only - Sep 29 24:00u 0 S
Rule Zion 1957 only - Apr 27 24:00u 1:00 D
Rule Zion 1957 only - Sep 21 24:00u 0 S
Rule Zion 1974 only - Jul 6 24:00 1:00 D
Rule Zion 1974 only - Oct 12 24:00 0 S
Rule Zion 1975 only - Apr 19 24:00 1:00 D
Rule Zion 1975 only - Aug 30 24:00 0 S
# From Alois Treindl (2019-03-06):
# http://www.moin.gov.il/Documents/שעון%20קיץ/clock-50-years-7-2014.pdf
# From Isaac Starkman (2019-03-06):
# Summer time was in that period in 1980 and 1984, see
# https://www.ynet.co.il/articles/0,7340,L-3951073,00.html
# You can of course read it in translation.
# I checked the local newspapers for that years.
# It started on midnight and end at 01.00 am.
# From Paul Eggert (2019-03-06):
# Also see this thread about the moin.gov.il URL:
# https://mm.icann.org/pipermail/tz/2018-November/027194.html
Rule Zion 1980 only - Aug 2 24:00s 1:00 D
Rule Zion 1980 only - Sep 13 24:00s 0 S
Rule Zion 1984 only - May 5 24:00s 1:00 D
Rule Zion 1984 only - Aug 25 24:00s 0 S
Rule Zion 1985 only - Apr 13 24:00 1:00 D
Rule Zion 1985 only - Aug 31 24:00 0 S
Rule Zion 1986 only - May 17 24:00 1:00 D
Rule Zion 1986 only - Sep 6 24:00 0 S
Rule Zion 1987 only - Apr 14 24:00 1:00 D
Rule Zion 1987 only - Sep 12 24:00 0 S
# From Avigdor Finkelstein (2014-03-05):
# I check the Parliament (Knesset) records and there it's stated that the
# [1988] transition should take place on Saturday night, when the Sabbath
# ends and changes to Sunday.
Rule Zion 1988 only - Apr 9 24:00 1:00 D
Rule Zion 1988 only - Sep 3 24:00 0 S
# From Ephraim Silverberg
# (1997-03-04, 1998-03-16, 1998-12-28, 2000-01-17, 2000-07-25, 2004-12-22,
# and 2005-02-17):
# According to the Office of the Secretary General of the Ministry of
# Interior, there is NO set rule for Daylight-Savings/Standard time changes.
# One thing is entrenched in law, however: that there must be at least 150
# days of daylight savings time annually. From 1993-1998, the change to
# daylight savings time was on a Friday morning from midnight IST to
# 1 a.m IDT; up until 1998, the change back to standard time was on a
# Saturday night from midnight daylight savings time to 11 p.m. standard
# time. 1996 is an exception to this rule where the change back to standard
# time took place on Sunday night instead of Saturday night to avoid
# conflicts with the Jewish New Year. In 1999, the change to
# daylight savings time was still on a Friday morning but from
# 2 a.m. IST to 3 a.m. IDT; furthermore, the change back to standard time
# was also on a Friday morning from 2 a.m. IDT to 1 a.m. IST for
# 1999 only. In the year 2000, the change to daylight savings time was
# similar to 1999, but although the change back will be on a Friday, it
# will take place from 1 a.m. IDT to midnight IST. Starting in 2001, all
# changes to/from will take place at 1 a.m. old time, but now there is no
# rule as to what day of the week it will take place in as the start date
# (except in 2003) is the night after the Passover Seder (i.e. the eve
# of the 16th of Nisan in the lunar Hebrew calendar) and the end date
# (except in 2002) is three nights before Yom Kippur [Day of Atonement]
# (the eve of the 7th of Tishrei in the lunar Hebrew calendar).
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Zion 1989 only - Apr 29 24:00 1:00 D
Rule Zion 1989 only - Sep 2 24:00 0 S
Rule Zion 1990 only - Mar 24 24:00 1:00 D
Rule Zion 1990 only - Aug 25 24:00 0 S
Rule Zion 1991 only - Mar 23 24:00 1:00 D
Rule Zion 1991 only - Aug 31 24:00 0 S
Rule Zion 1992 only - Mar 28 24:00 1:00 D
Rule Zion 1992 only - Sep 5 24:00 0 S
Rule Zion 1993 only - Apr 2 0:00 1:00 D
Rule Zion 1993 only - Sep 5 0:00 0 S
# The dates for 1994-1995 were obtained from Office of the Spokeswoman for the
# Ministry of Interior, Jerusalem, Israel. The spokeswoman can be reached by
# calling the office directly at 972-2-6701447 or 972-2-6701448.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Zion 1994 only - Apr 1 0:00 1:00 D
Rule Zion 1994 only - Aug 28 0:00 0 S
Rule Zion 1995 only - Mar 31 0:00 1:00 D
Rule Zion 1995 only - Sep 3 0:00 0 S
# The dates for 1996 were determined by the Minister of Interior of the
# time, Haim Ramon. The official announcement regarding 1996-1998
# (with the dates for 1997-1998 no longer being relevant) can be viewed at:
#
# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/1996-1998.ramon.ps.gz
#
# The dates for 1997-1998 were altered by his successor, Rabbi Eli Suissa.
#
# The official announcements for the years 1997-1999 can be viewed at:
#
# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/YYYY.ps.gz
#
# where YYYY is the relevant year.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Zion 1996 only - Mar 14 24:00 1:00 D
Rule Zion 1996 only - Sep 15 24:00 0 S
Rule Zion 1997 only - Mar 20 24:00 1:00 D
Rule Zion 1997 only - Sep 13 24:00 0 S
Rule Zion 1998 only - Mar 20 0:00 1:00 D
Rule Zion 1998 only - Sep 6 0:00 0 S
Rule Zion 1999 only - Apr 2 2:00 1:00 D
Rule Zion 1999 only - Sep 3 2:00 0 S
# The Knesset Interior Committee has changed the dates for 2000 for
# the third time in just over a year and have set new dates for the
# years 2001-2004 as well.
#
# The official announcement for the start date of 2000 can be viewed at:
#
# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2000-start.ps.gz
#
# The official announcement for the end date of 2000 and the dates
# for the years 2001-2004 can be viewed at:
#
# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2000-2004.ps.gz
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Zion 2000 only - Apr 14 2:00 1:00 D
Rule Zion 2000 only - Oct 6 1:00 0 S
Rule Zion 2001 only - Apr 9 1:00 1:00 D
Rule Zion 2001 only - Sep 24 1:00 0 S
Rule Zion 2002 only - Mar 29 1:00 1:00 D
Rule Zion 2002 only - Oct 7 1:00 0 S
Rule Zion 2003 only - Mar 28 1:00 1:00 D
Rule Zion 2003 only - Oct 3 1:00 0 S
Rule Zion 2004 only - Apr 7 1:00 1:00 D
Rule Zion 2004 only - Sep 22 1:00 0 S
# The proposed law agreed upon by the Knesset Interior Committee on
# 2005-02-14 is that, for 2005 and beyond, DST starts at 02:00 the
# last Friday before April 2nd (i.e. the last Friday in March or April
# 1st itself if it falls on a Friday) and ends at 02:00 on the Saturday
# night _before_ the fast of Yom Kippur.
#
# Those who can read Hebrew can view the announcement at:
#
# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2005+beyond.ps
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Zion 2005 2012 - Apr Fri<=1 2:00 1:00 D
Rule Zion 2005 only - Oct 9 2:00 0 S
Rule Zion 2006 only - Oct 1 2:00 0 S
Rule Zion 2007 only - Sep 16 2:00 0 S
Rule Zion 2008 only - Oct 5 2:00 0 S
Rule Zion 2009 only - Sep 27 2:00 0 S
Rule Zion 2010 only - Sep 12 2:00 0 S
Rule Zion 2011 only - Oct 2 2:00 0 S
Rule Zion 2012 only - Sep 23 2:00 0 S
# From Ephraim Silverberg (2020-10-26):
# The current time law (2013) from the State of Israel can be viewed
# (in Hebrew) at:
# ftp://ftp.cs.huji.ac.il/pub/tz/israel/announcements/2013+law.pdf
# It translates to:
# Every year, in the period from the Friday before the last Sunday in
# the month of March at 02:00 a.m. until the last Sunday of the month
# of October at 02:00 a.m., Israel Time will be advanced an additional
# hour such that it will be UTC+3.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Zion 2013 max - Mar Fri>=23 2:00 1:00 D
Rule Zion 2013 max - Oct lastSun 2:00 0 S
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Jerusalem 2:20:54 - LMT 1880
2:20:40 - JMT 1918 # Jerusalem Mean Time?
2:00 Zion I%sT
###############################################################################
# Japan
# '9:00' and 'JST' is from Guy Harris.
# From Paul Eggert (2020-01-19):
# Starting in the 7th century, Japan generally followed an ancient Chinese
# timekeeping system that divided night and day into six hours each,
# with hour length depending on season. In 1873 the government
# started requiring the use of a Western style 24-hour clock. See:
# Yulia Frumer, "Making Time: Astronomical Time Measurement in Tokugawa Japan"
# . As the tzdb code and
# data support only 24-hour clocks, its tables model timestamps before
# 1873 using Western-style local mean time.
# From Hideyuki Suzuki (1998-11-09):
# 'Tokyo' usually stands for the former location of Tokyo Astronomical
# Observatory: 139° 44' 40.90" E (9h 18m 58.727s), 35° 39' 16.0" N.
# This data is from 'Rika Nenpyou (Chronological Scientific Tables) 1996'
# edited by National Astronomical Observatory of Japan....
# JST (Japan Standard Time) has been used since 1888-01-01 00:00 (JST).
# The law is enacted on 1886-07-07.
# From Hideyuki Suzuki (1998-11-16):
# The ordinance No. 51 (1886) established "standard time" in Japan,
# which stands for the time on 135° E.
# In the ordinance No. 167 (1895), "standard time" was renamed to "central
# standard time". And the same ordinance also established "western standard
# time", which stands for the time on 120° E.... But "western standard
# time" was abolished in the ordinance No. 529 (1937). In the ordinance No.
# 167, there is no mention regarding for what place western standard time is
# standard....
#
# I wrote "ordinance" above, but I don't know how to translate.
# In Japanese it's "chokurei", which means ordinance from emperor.
# From Yu-Cheng Chuang (2013-07-12):
# ...the Meiji Emperor announced Ordinance No. 167 of Meiji Year 28 "The clause
# about standard time" ... The adoption began from Jan 1, 1896.
# https://ja.wikisource.org/wiki/標準時ニ關スル件_(公布時)
#
# ...the Showa Emperor announced Ordinance No. 529 of Showa Year 12 ... which
# means the whole Japan territory, including later occupations, adopt Japan
# Central Time (UT+9). The adoption began on Oct 1, 1937.
# https://ja.wikisource.org/wiki/明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件
# From Paul Eggert (1995-03-06):
# Today's _Asahi Evening News_ (page 4) reports that Japan had
# daylight saving between 1948 and 1951, but "the system was discontinued
# because the public believed it would lead to longer working hours."
# From Mayumi Negishi in the 2005-08-10 Japan Times:
# http://www.japantimes.co.jp/cgi-bin/getarticle.pl5?nn20050810f2.htm
# Occupation authorities imposed daylight-saving time on Japan on
# [1948-05-01].... But lack of prior debate and the execution of
# daylight-saving time just three days after the bill was passed generated
# deep hatred of the concept.... The Diet unceremoniously passed a bill to
# dump the unpopular system in October 1951, less than a month after the San
# Francisco Peace Treaty was signed. (A government poll in 1951 showed 53%
# of the Japanese wanted to scrap daylight-saving time, as opposed to 30% who
# wanted to keep it.)
# From Takayuki Nikai (2018-01-19):
# The source of information is Japanese law.
# http://www.shugiin.go.jp/internet/itdb_housei.nsf/html/houritsu/00219480428029.htm
# http://www.shugiin.go.jp/internet/itdb_housei.nsf/html/houritsu/00719500331039.htm
# ... In summary, it is written as follows. From 24:00 on the first Saturday
# in May, until 0:00 on the day after the second Saturday in September.
# From Phake Nick (2018-09-27):
# [T]he webpage authored by National Astronomical Observatory of Japan
# https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EF.html
# ... mentioned that using Showa 23 (year 1948) as example, 13pm of September
# 11 in summer time will equal to 0am of September 12 in standard time.
# It cited a document issued by the Liaison Office which briefly existed
# during the postwar period of Japan, where the detail on implementation
# of the summer time is described in the document.
# https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EFB2C6BBFEB9EFA4CEBCC2BBDCA4CBA4C4A4A4A4C6.pdf
# The text in the document do instruct a fall back to occur at
# September 11, 13pm in summer time, while ordinary citizens can
# change the clock before they sleep.
#
# From Paul Eggert (2018-09-27):
# This instruction is equivalent to "Sat>=8 25:00", so use that. zic treats
# it like "Sun>=9 01:00", which is not quite the same but is the best we can
# do in any POSIX or C platform. The "25:00" assumes zic from 2007 or later,
# which should be safe now.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Japan 1948 only - May Sat>=1 24:00 1:00 D
Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S
Rule Japan 1949 only - Apr Sat>=1 24:00 1:00 D
Rule Japan 1950 1951 - May Sat>=1 24:00 1:00 D
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Tokyo 9:18:59 - LMT 1887 Dec 31 15:00u
9:00 Japan J%sT
# Since 1938, all Japanese possessions have been like Asia/Tokyo,
# except that Truk (Chuuk), Ponape (Pohnpei), and Jaluit (Kosrae) did not
# switch from +10 to +09 until 1941-04-01; see the 'australasia' file.
# Jordan
#
# From
# Jordan Week (1999-07-01) via Steffen Thorsen (1999-09-09):
# Clocks in Jordan were forwarded one hour on Wednesday at midnight,
# in accordance with the government's decision to implement summer time
# all year round.
#
# From
# Jordan Week (1999-09-30) via Steffen Thorsen (1999-11-09):
# Winter time starts today Thursday, 30 September. Clocks will be turned back
# by one hour. This is the latest government decision and it's final!
# The decision was taken because of the increase in working hours in
# government's departments from six to seven hours.
#
# From Paul Eggert (2005-11-22):
# Starting 2003 transitions are from Steffen Thorsen's web site timeanddate.com.
#
# From Steffen Thorsen (2005-11-23):
# For Jordan I have received multiple independent user reports every year
# about DST end dates, as the end-rule is different every year.
#
# From Steffen Thorsen (2006-10-01), after a heads-up from Hilal Malawi:
# http://www.petranews.gov.jo/nepras/2006/Sep/05/4000.htm
# "Jordan will switch to winter time on Friday, October 27".
#
# From Steffen Thorsen (2009-04-02):
# This single one might be good enough, (2009-03-24, Arabic):
# http://petra.gov.jo/Artical.aspx?Lng=2&Section=8&Artical=95279
#
# Google's translation:
#
# > The Council of Ministers decided in 2002 to adopt the principle of timely
# > submission of the summer at 60 minutes as of midnight on the last Thursday
# > of the month of March of each year.
#
# So - this means the midnight between Thursday and Friday since 2002.
# From Arthur David Olson (2009-04-06):
# We still have Jordan switching to DST on Thursdays in 2000 and 2001.
# From Steffen Thorsen (2012-10-25):
# Yesterday the government in Jordan announced that they will not
# switch back to standard time this winter, so the will stay on DST
# until about the same time next year (at least).
# http://www.petra.gov.jo/Public_News/Nws_NewsDetails.aspx?NewsID=88950
# From Steffen Thorsen (2013-12-11):
# Jordan Times and other sources say that Jordan is going back to
# UTC+2 on 2013-12-19 at midnight:
# http://jordantimes.com/govt-decides-to-switch-back-to-wintertime
# Official, in Arabic:
# http://www.petra.gov.jo/public_news/Nws_NewsDetails.aspx?Menu_ID=&Site_Id=2&lang=1&NewsID=133230&CatID=14
# ... Our background/permalink about it
# https://www.timeanddate.com/news/time/jordan-reverses-dst-decision.html
# ...
# http://www.petra.gov.jo/Public_News/Nws_NewsDetails.aspx?lang=2&site_id=1&NewsID=133313&Type=P
# ... says midnight for the coming one and 1:00 for the ones in the future
# (and they will use DST again next year, using the normal schedule).
# From Paul Eggert (2013-12-11):
# As Steffen suggested, consider the past 21-month experiment to be DST.
# From Steffen Thorsen (2021-09-24):
# The Jordanian Government announced yesterday that they will start DST
# in February instead of March:
# https://petra.gov.jo/Include/InnerPage.jsp?ID=37683&lang=en&name=en_news (English)
# https://petra.gov.jo/Include/InnerPage.jsp?ID=189969&lang=ar&name=news (Arabic)
# From the Arabic version, it seems to say it would be at midnight
# (assume 24:00) on the last Thursday in February, starting from 2022.
# From Issam Al-Zuwairi (2022-10-05):
# The Council of Ministers in Jordan decided Wednesday 5th October 2022,
# that daylight saving time (DST) will be throughout the year....
#
# From Brian Inglis (2022-10-06):
# https://petra.gov.jo/Include/InnerPage.jsp?ID=45567&lang=en&name=en_news
#
# From Paul Eggert (2022-10-05):
# Like Syria, model this as a transition from EEST +03 (DST) to plain +03
# (non-DST) at the point where DST would otherwise have ended.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Jordan 1973 only - Jun 6 0:00 1:00 S
Rule Jordan 1973 1975 - Oct 1 0:00 0 -
Rule Jordan 1974 1977 - May 1 0:00 1:00 S
Rule Jordan 1976 only - Nov 1 0:00 0 -
Rule Jordan 1977 only - Oct 1 0:00 0 -
Rule Jordan 1978 only - Apr 30 0:00 1:00 S
Rule Jordan 1978 only - Sep 30 0:00 0 -
Rule Jordan 1985 only - Apr 1 0:00 1:00 S
Rule Jordan 1985 only - Oct 1 0:00 0 -
Rule Jordan 1986 1988 - Apr Fri>=1 0:00 1:00 S
Rule Jordan 1986 1990 - Oct Fri>=1 0:00 0 -
Rule Jordan 1989 only - May 8 0:00 1:00 S
Rule Jordan 1990 only - Apr 27 0:00 1:00 S
Rule Jordan 1991 only - Apr 17 0:00 1:00 S
Rule Jordan 1991 only - Sep 27 0:00 0 -
Rule Jordan 1992 only - Apr 10 0:00 1:00 S
Rule Jordan 1992 1993 - Oct Fri>=1 0:00 0 -
Rule Jordan 1993 1998 - Apr Fri>=1 0:00 1:00 S
Rule Jordan 1994 only - Sep Fri>=15 0:00 0 -
Rule Jordan 1995 1998 - Sep Fri>=15 0:00s 0 -
Rule Jordan 1999 only - Jul 1 0:00s 1:00 S
Rule Jordan 1999 2002 - Sep lastFri 0:00s 0 -
Rule Jordan 2000 2001 - Mar lastThu 0:00s 1:00 S
Rule Jordan 2002 2012 - Mar lastThu 24:00 1:00 S
Rule Jordan 2003 only - Oct 24 0:00s 0 -
Rule Jordan 2004 only - Oct 15 0:00s 0 -
Rule Jordan 2005 only - Sep lastFri 0:00s 0 -
Rule Jordan 2006 2011 - Oct lastFri 0:00s 0 -
Rule Jordan 2013 only - Dec 20 0:00 0 -
Rule Jordan 2014 2021 - Mar lastThu 24:00 1:00 S
Rule Jordan 2014 2022 - Oct lastFri 0:00s 0 -
Rule Jordan 2022 only - Feb lastThu 24:00 1:00 S
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Amman 2:23:44 - LMT 1931
2:00 Jordan EE%sT 2022 Oct 28 0:00s
3:00 - +03
# Kazakhstan
# From Kazakhstan Embassy's News Bulletin No. 11
# (2005-03-21):
# The Government of Kazakhstan passed a resolution March 15 abolishing
# daylight saving time citing lack of economic benefits and health
# complications coupled with a decrease in productivity.
#
# From Branislav Kojic (in Astana) via Gwillim Law (2005-06-28):
# ... what happened was that the former Kazakhstan Eastern time zone
# was "blended" with the Central zone. Therefore, Kazakhstan now has
# two time zones, and difference between them is one hour. The zone
# closer to UTC is the former Western zone (probably still called the
# same), encompassing four provinces in the west: Aqtöbe, Atyraū,
# Mangghystaū, and West Kazakhstan. The other zone encompasses
# everything else.... I guess that would make Kazakhstan time zones
# de jure UTC+5 and UTC+6 respectively.
# From Stepan Golosunov (2016-03-27):
# Review of the linked documents from http://adilet.zan.kz/
# produced the following data for post-1991 Kazakhstan:
#
# 0. Act of the Cabinet of Ministers of the USSR
# from 1991-02-04 No. 20
# http://pravo.gov.ru/proxy/ips/?docbody=&nd=102010545
# removed the extra hour ("decree time") on the territory of the USSR
# starting with the last Sunday of March 1991.
# It also allowed (but not mandated) Kazakh SSR, Kirghiz SSR, Tajik SSR,
# Turkmen SSR and Uzbek SSR to not have "summer" time.
#
# The 1992-01-13 act also refers to the act of the Cabinet of Ministers
# of the Kazakh SSR from 1991-03-20 No. 170 "About the act of the Cabinet
# of Ministers of the USSR from 1991-02-04 No. 20" but I didn't found its
# text.
#
# According to Izvestia newspaper No. 68 (23334) from 1991-03-20
# -- page 6; available at http://libinfo.org/newsr/newsr2574.djvu via
# http://libinfo.org/index.php?id=58564 -- on 1991-03-31 at 2:00 during
# transition to "summer" time:
# Republic of Georgia, Latvian SSR, Lithuanian SSR, SSR Moldova,
# Estonian SSR; Komi ASSR; Kaliningrad oblast; Nenets autonomous okrug
# were to move clocks 1 hour forward.
# Kazakh SSR (excluding Uralsk oblast); Republic of Kyrgyzstan, Tajik
# SSR; Andijan, Jizzakh, Namangan, Sirdarya, Tashkent, Fergana oblasts
# of the Uzbek SSR were to move clocks 1 hour backwards.
# Other territories were to not move clocks.
# When the "summer" time would end on 1991-09-29, clocks were to be
# moved 1 hour backwards on the territory of the USSR excluding
# Kazakhstan, Kirghizia, Uzbekistan, Turkmenia, Tajikistan.
#
# Apparently there were last minute changes. Apparently Kazakh act No. 170
# was one of such changes.
#
# https://ru.wikipedia.org/wiki/Декретное_время
# claims that Sovetskaya Rossiya newspaper on 1991-03-29 published that
# Nenets autonomous okrug, Komi and Kazakhstan (excluding Uralsk oblast)
# were to not move clocks and Uralsk oblast was to move clocks
# forward; on 1991-09-29 Kazakhstan was to move clocks backwards.
# (Probably there were changes even after that publication. There is an
# article claiming that Kaliningrad oblast decided on 1991-03-29 to not
# move clocks.)
#
# This implies that on 1991-03-31 Asia/Oral remained on +04/+05 while
# the rest of Kazakhstan switched from +06/+07 to +05/06 or from +05/06
# to +04/+05. It's unclear how Qyzylorda oblast moved into the fifth
# time belt. (By switching from +04/+05 to +05/+06 on 1991-09-29?) ...
#
# 1. Act of the Cabinet of Ministers of the Republic of Kazakhstan
# from 1992-01-13 No. 28
# http://adilet.zan.kz/rus/docs/P920000028_
# (text includes modification from the 1996 act)
# introduced new rules for calculation of time, mirroring Russian
# 1992-01-08 act. It specified that time would be calculated
# according to time belts plus extra hour ("decree time"), moved clocks
# on the whole territory of Kazakhstan 1 hour forward on 1992-01-19 at
# 2:00, specified DST rules. It acknowledged that Kazakhstan was
# located in the fourth and the fifth time belts and specified the
# border between them to be located east of Qostanay and Aktyubinsk
# oblasts (notably including Turgai and Qyzylorda oblasts into the fifth
# time belt).
#
# This means switch on 1992-01-19 at 2:00 from +04/+05 to +05/+06 for
# Asia/Aqtau, Asia/Aqtobe, Asia/Oral, Atyraū and Qostanay oblasts; from
# +05/+06 to +06/+07 for Asia/Almaty and Asia/Qyzylorda (and Arkalyk)....
#
# 2. Act of the Cabinet of Ministers of the Republic of Kazakhstan
# from 1992-03-27 No. 284
# http://adilet.zan.kz/rus/docs/P920000284_
# cancels extra hour ("decree time") for Uralsk and Qyzylorda oblasts
# since the last Sunday of March 1992, while keeping them in the fourth
# and the fifth time belts respectively.
#
# 3. Order of the Prime Minister of the Republic of Kazakhstan
# from 1994-09-23 No. 384
# http://adilet.zan.kz/rus/docs/R940000384_
# cancels the extra hour ("decree time") on the territory of Mangghystaū
# oblast since the last Sunday of September 1994 (saying that time on
# the territory would correspond to the third time belt as a
# result)....
#
# 4. Act of the Government of the Republic of Kazakhstan
# from 1996-05-08 No. 575
# http://adilet.zan.kz/rus/docs/P960000575_
# amends the 1992-01-13 act to end summer time in October instead
# of September, mirroring identical Russian change from 1996-04-23 act.
#
# 5. Act of the Government of the Republic of Kazakhstan
# from 1999-03-26 No. 305
# http://adilet.zan.kz/rus/docs/P990000305_
# cancels the extra hour ("decree time") for Atyraū oblast since the
# last Sunday of March 1999 while retaining the oblast in the fourth
# time belt.
#
# This means change from +05/+06 to +04/+05....
#
# 6. Act of the Government of the Republic of Kazakhstan
# from 2000-11-23 No. 1749
# http://adilet.zan.kz/rus/archive/docs/P000001749_/23.11.2000
# replaces the previous five documents.
#
# The only changes I noticed are in definition of the border between the
# fourth and the fifth time belts. They account for changes in spelling
# and administrative division (splitting of Turgai oblast in 1997
# probably changed time in territories incorporated into Qostanay oblast
# (including Arkalyk) from +06/+07 to +05/+06) and move Qyzylorda oblast
# from being in the fifth time belt and not using decree time into the
# fourth time belt (no change in practice).
#
# 7. Act of the Government of the Republic of Kazakhstan
# from 2003-12-29 No. 1342
# http://adilet.zan.kz/rus/docs/P030001342_
# modified the 2000-11-23 act. No relevant changes, apparently.
#
# 8. Act of the Government of the Republic of Kazakhstan
# from 2004-07-20 No. 775
# http://adilet.zan.kz/rus/archive/docs/P040000775_/20.07.2004
# modified the 2000-11-23 act to move Qostanay and Qyzylorda oblasts into
# the fifth time belt and add Aktobe oblast to the list of regions not
# using extra hour ("decree time"), leaving Kazakhstan with only 2 time
# zones (+04/+05 and +06/+07). The changes were to be implemented
# during DST transitions in 2004 and 2005 but the acts got radically
# amended before implementation happened.
#
# 9. Act of the Government of the Republic of Kazakhstan
# from 2004-09-15 No. 1059
# http://adilet.zan.kz/rus/docs/P040001059_
# modified the 2000-11-23 act to remove exceptions from the "decree time"
# (leaving Kazakhstan in +05/+06 and +06/+07 zones), amended the
# 2004-07-20 act to implement changes for Atyraū, West Kazakhstan,
# Qostanay, Qyzylorda and Mangghystaū oblasts by not moving clocks
# during the 2004 transition to "winter" time.
#
# This means transition from +04/+05 to +05/+06 for Atyraū oblast (no
# zone currently), Asia/Oral, Asia/Aqtau and transition from +05/+06 to
# +06/+07 for Qostanay oblast (Qostanay and Arkalyk, no zones currently)
# and Asia/Qyzylorda on 2004-10-31 at 3:00....
#
# 10. Act of the Government of the Republic of Kazakhstan
# from 2005-03-15 No. 231
# http://adilet.zan.kz/rus/docs/P050000231_
# removes DST provisions from the 2000-11-23 act, removes most of the
# (already implemented) provisions from the 2004-07-20 and 2004-09-15
# acts, comes into effect 10 days after official publication.
# The only practical effect seems to be the abolition of the summer
# time.
#
# Unamended version of the act of the Government of the Russian Federation
# No. 23 from 1992-01-08 [See 'europe' file for details].
# Kazakh 1992-01-13 act appears to provide the same rules and 1992-03-27
# act was to be enacted on the last Sunday of March 1992.
# From Stepan Golosunov (2016-11-08):
# Turgai reorganization should affect only southern part of Qostanay
# oblast. Which should probably be separated into Asia/Arkalyk zone.
# (There were also 1970, 1988 and 1990 Turgai oblast reorganizations
# according to wikipedia.)
#
# [For Qostanay] http://www.ng.kz/gazeta/195/hranit/
# suggests that clocks were to be moved 40 minutes backwards on
# 1920-01-01 to the fourth time belt. But I do not understand
# how that could happen....
#
# [For Atyrau and Oral] 1919 decree
# (http://www.worldtimezone.com/dst_news/dst_news_russia-1919-02-08.html
# and in Byalokoz) lists Ural river (plus 10 versts on its left bank) in
# the third time belt (before 1930 this means +03).
# From Alexander Konzurovski (2018-12-20):
# (Asia/Qyzylorda) is changing its time zone from UTC+6 to UTC+5
# effective December 21st, 2018....
# http://adilet.zan.kz/rus/docs/P1800000817 (russian language).
# Zone NAME STDOFF RULES FORMAT [UNTIL]
#
# Almaty (formerly Alma-Ata), representing most locations in Kazakhstan
# This includes KZ-AKM, KZ-ALA, KZ-ALM, KZ-AST, KZ-BAY, KZ-VOS, KZ-ZHA,
# KZ-KAR, KZ-SEV, KZ-PAV, and KZ-YUZ.
Zone Asia/Almaty 5:07:48 - LMT 1924 May 2 # or Alma-Ata
5:00 - +05 1930 Jun 21
6:00 RussiaAsia +06/+07 1991 Mar 31 2:00s
5:00 RussiaAsia +05/+06 1992 Jan 19 2:00s
6:00 RussiaAsia +06/+07 2004 Oct 31 2:00s
6:00 - +06
# Qyzylorda (aka Kyzylorda, Kizilorda, Kzyl-Orda, etc.) (KZ-KZY)
Zone Asia/Qyzylorda 4:21:52 - LMT 1924 May 2
4:00 - +04 1930 Jun 21
5:00 - +05 1981 Apr 1
5:00 1:00 +06 1981 Oct 1
6:00 - +06 1982 Apr 1
5:00 RussiaAsia +05/+06 1991 Mar 31 2:00s
4:00 RussiaAsia +04/+05 1991 Sep 29 2:00s
5:00 RussiaAsia +05/+06 1992 Jan 19 2:00s
6:00 RussiaAsia +06/+07 1992 Mar 29 2:00s
5:00 RussiaAsia +05/+06 2004 Oct 31 2:00s
6:00 - +06 2018 Dec 21 0:00
5:00 - +05
#
# Qostanay (aka Kostanay, Kustanay) (KZ-KUS)
# The 1991/2 rules are unclear partly because of the 1997 Turgai
# reorganization.
Zone Asia/Qostanay 4:14:28 - LMT 1924 May 2
4:00 - +04 1930 Jun 21
5:00 - +05 1981 Apr 1
5:00 1:00 +06 1981 Oct 1
6:00 - +06 1982 Apr 1
5:00 RussiaAsia +05/+06 1991 Mar 31 2:00s
4:00 RussiaAsia +04/+05 1992 Jan 19 2:00s
5:00 RussiaAsia +05/+06 2004 Oct 31 2:00s
6:00 - +06
# Aqtöbe (aka Aktobe, formerly Aktyubinsk) (KZ-AKT)
Zone Asia/Aqtobe 3:48:40 - LMT 1924 May 2
4:00 - +04 1930 Jun 21
5:00 - +05 1981 Apr 1
5:00 1:00 +06 1981 Oct 1
6:00 - +06 1982 Apr 1
5:00 RussiaAsia +05/+06 1991 Mar 31 2:00s
4:00 RussiaAsia +04/+05 1992 Jan 19 2:00s
5:00 RussiaAsia +05/+06 2004 Oct 31 2:00s
5:00 - +05
# Mangghystaū (KZ-MAN)
# Aqtau was not founded until 1963, but it represents an inhabited region,
# so include timestamps before 1963.
Zone Asia/Aqtau 3:21:04 - LMT 1924 May 2
4:00 - +04 1930 Jun 21
5:00 - +05 1981 Oct 1
6:00 - +06 1982 Apr 1
5:00 RussiaAsia +05/+06 1991 Mar 31 2:00s
4:00 RussiaAsia +04/+05 1992 Jan 19 2:00s
5:00 RussiaAsia +05/+06 1994 Sep 25 2:00s
4:00 RussiaAsia +04/+05 2004 Oct 31 2:00s
5:00 - +05
# Atyraū (KZ-ATY) is like Mangghystaū except it switched from
# +04/+05 to +05/+06 in spring 1999, not fall 1994.
Zone Asia/Atyrau 3:27:44 - LMT 1924 May 2
3:00 - +03 1930 Jun 21
5:00 - +05 1981 Oct 1
6:00 - +06 1982 Apr 1
5:00 RussiaAsia +05/+06 1991 Mar 31 2:00s
4:00 RussiaAsia +04/+05 1992 Jan 19 2:00s
5:00 RussiaAsia +05/+06 1999 Mar 28 2:00s
4:00 RussiaAsia +04/+05 2004 Oct 31 2:00s
5:00 - +05
# West Kazakhstan (KZ-ZAP)
# From Paul Eggert (2016-03-18):
# The 1989 transition is from USSR act No. 227 (1989-03-14).
Zone Asia/Oral 3:25:24 - LMT 1924 May 2 # or Ural'sk
3:00 - +03 1930 Jun 21
5:00 - +05 1981 Apr 1
5:00 1:00 +06 1981 Oct 1
6:00 - +06 1982 Apr 1
5:00 RussiaAsia +05/+06 1989 Mar 26 2:00s
4:00 RussiaAsia +04/+05 1992 Jan 19 2:00s
5:00 RussiaAsia +05/+06 1992 Mar 29 2:00s
4:00 RussiaAsia +04/+05 2004 Oct 31 2:00s
5:00 - +05
# Kyrgyzstan (Kirgizstan)
# Transitions through 1991 are from Shanks & Pottenger.
# From Paul Eggert (2005-08-15):
# According to an article dated today in the Kyrgyzstan Development Gateway
# http://eng.gateway.kg/cgi-bin/page.pl?id=1&story_name=doc9979.shtml
# Kyrgyzstan is canceling the daylight saving time system. I take the article
# to mean that they will leave their clocks at 6 hours ahead of UTC.
# From Malik Abdugaliev (2005-09-21):
# Our government cancels daylight saving time 6th of August 2005.
# From 2005-08-12 our GMT-offset is +6, w/o any daylight saving.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Kyrgyz 1992 1996 - Apr Sun>=7 0:00s 1:00 -
Rule Kyrgyz 1992 1996 - Sep lastSun 0:00 0 -
Rule Kyrgyz 1997 2005 - Mar lastSun 2:30 1:00 -
Rule Kyrgyz 1997 2004 - Oct lastSun 2:30 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Bishkek 4:58:24 - LMT 1924 May 2
5:00 - +05 1930 Jun 21
6:00 RussiaAsia +06/+07 1991 Mar 31 2:00s
5:00 RussiaAsia +05/+06 1991 Aug 31 2:00
5:00 Kyrgyz +05/+06 2005 Aug 12
6:00 - +06
###############################################################################
# Korea (North and South)
# From Annie I. Bang (2006-07-10):
# http://www.koreaherald.com/view.php?ud=200607100012
# Korea ran a daylight saving program from 1949-61 but stopped it
# during the 1950-53 Korean War. The system was temporarily enforced
# between 1987 and 1988 ...
# From Sanghyuk Jung (2014-10-29):
# https://mm.icann.org/pipermail/tz/2014-October/021830.html
# According to the Korean Wikipedia
# https://ko.wikipedia.org/wiki/한국_표준시
# [oldid=12896437 2014-09-04 08:03 UTC]
# DST in Republic of Korea was as follows.... And I checked old
# newspapers in Korean, all articles correspond with data in Wikipedia.
# For example, the article in 1948 (Korean Language) proved that DST
# started at June 1 in that year. For another example, the article in
# 1988 said that DST started at 2:00 AM in that year.
# From Phake Nick (2018-10-27):
# 1. According to official announcement from Korean government, the DST end
# date in South Korea should be
# 1955-09-08 without specifying time
# http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027977557
# 1956-09-29 without specifying time
# http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027978341
# 1957-09-21 24 o'clock
# http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027979690#3
# 1958-09-20 24 o'clock
# http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027981189
# 1959-09-19 24 o'clock
# http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027982974#2
# 1960-09-17 24 o'clock
# http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0028044104
# ...
# 2.... https://namu.wiki/w/대한민국%20표준시 ... [says]
# when Korea was using GMT+8:30 as standard time, the international
# aviation/marine/meteorological industry in the country refused to
# follow and continued to use GMT+9:00 for interoperability.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule ROK 1948 only - Jun 1 0:00 1:00 D
Rule ROK 1948 only - Sep 12 24:00 0 S
Rule ROK 1949 only - Apr 3 0:00 1:00 D
Rule ROK 1949 1951 - Sep Sat>=7 24:00 0 S
Rule ROK 1950 only - Apr 1 0:00 1:00 D
Rule ROK 1951 only - May 6 0:00 1:00 D
Rule ROK 1955 only - May 5 0:00 1:00 D
Rule ROK 1955 only - Sep 8 24:00 0 S
Rule ROK 1956 only - May 20 0:00 1:00 D
Rule ROK 1956 only - Sep 29 24:00 0 S
Rule ROK 1957 1960 - May Sun>=1 0:00 1:00 D
Rule ROK 1957 1960 - Sep Sat>=17 24:00 0 S
Rule ROK 1987 1988 - May Sun>=8 2:00 1:00 D
Rule ROK 1987 1988 - Oct Sun>=8 3:00 0 S
# From Paul Eggert (2016-08-23):
# The Korean Wikipedia entry gives the following sources for UT offsets:
#
# 1908: Official Journal Article No. 3994 (decree No. 5)
# 1912: Governor-General of Korea Official Gazette Issue No. 367
# (Announcement No. 338)
# 1954: Presidential Decree No. 876 (1954-03-17)
# 1961: Law No. 676 (1961-08-07)
#
# (Another source "1987: Law No. 3919 (1986-12-31)" was in the 2014-10-30
# edition of the Korean Wikipedia entry.)
#
# I guessed that time zone abbreviations through 1945 followed the same
# rules as discussed under Taiwan, with nominal switches from JST to KST
# when the respective cities were taken over by the Allies after WWII.
#
# For Pyongyang, guess no changes from World War II until 2015, as we
# have no information otherwise.
# From Steffen Thorsen (2015-08-07):
# According to many news sources, North Korea is going to change to
# the 8:30 time zone on August 15, one example:
# http://www.bbc.com/news/world-asia-33815049
#
# From Paul Eggert (2015-08-15):
# Bells rang out midnight (00:00) Friday as part of the celebrations. See:
# Talmadge E. North Korea celebrates new time zone, 'Pyongyang Time'
# http://news.yahoo.com/north-korea-celebrates-time-zone-pyongyang-time-164038128.html
# There is no common English-language abbreviation for this time zone.
# Use KST, as that's what we already use for 1954-1961 in ROK.
# From Kang Seonghoon (2018-04-29):
# North Korea will revert its time zone from UTC+8:30 (PYT; Pyongyang
# Time) back to UTC+9 (KST; Korea Standard Time).
#
# From Seo Sanghyeon (2018-04-30):
# Rodong Sinmun 2018-04-30 announced Pyongyang Time transition plan.
# https://www.nknews.org/kcna/wp-content/uploads/sites/5/2018/04/rodong-2018-04-30.pdf
# ... the transition date is 2018-05-05 ... Citation should be Decree
# No. 2232 of April 30, 2018, of the Presidium of the Supreme People's
# Assembly, as published in Rodong Sinmun.
# From Tim Parenti (2018-04-29):
# It appears to be the front page story at the top in the right-most column.
#
# From Paul Eggert (2018-05-04):
# The BBC reported that the transition was from 23:30 to 24:00 today.
# https://www.bbc.com/news/world-asia-44010705
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Seoul 8:27:52 - LMT 1908 Apr 1
8:30 - KST 1912 Jan 1
9:00 - JST 1945 Sep 8
9:00 ROK K%sT 1954 Mar 21
8:30 ROK K%sT 1961 Aug 10
9:00 ROK K%sT
Zone Asia/Pyongyang 8:23:00 - LMT 1908 Apr 1
8:30 - KST 1912 Jan 1
9:00 - JST 1945 Aug 24
9:00 - KST 2015 Aug 15 00:00
8:30 - KST 2018 May 4 23:30
9:00 - KST
# Lebanon
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Lebanon 1920 only - Mar 28 0:00 1:00 S
Rule Lebanon 1920 only - Oct 25 0:00 0 -
Rule Lebanon 1921 only - Apr 3 0:00 1:00 S
Rule Lebanon 1921 only - Oct 3 0:00 0 -
Rule Lebanon 1922 only - Mar 26 0:00 1:00 S
Rule Lebanon 1922 only - Oct 8 0:00 0 -
Rule Lebanon 1923 only - Apr 22 0:00 1:00 S
Rule Lebanon 1923 only - Sep 16 0:00 0 -
Rule Lebanon 1957 1961 - May 1 0:00 1:00 S
Rule Lebanon 1957 1961 - Oct 1 0:00 0 -
Rule Lebanon 1972 only - Jun 22 0:00 1:00 S
Rule Lebanon 1972 1977 - Oct 1 0:00 0 -
Rule Lebanon 1973 1977 - May 1 0:00 1:00 S
Rule Lebanon 1978 only - Apr 30 0:00 1:00 S
Rule Lebanon 1978 only - Sep 30 0:00 0 -
Rule Lebanon 1984 1987 - May 1 0:00 1:00 S
Rule Lebanon 1984 1991 - Oct 16 0:00 0 -
Rule Lebanon 1988 only - Jun 1 0:00 1:00 S
Rule Lebanon 1989 only - May 10 0:00 1:00 S
Rule Lebanon 1990 1992 - May 1 0:00 1:00 S
Rule Lebanon 1992 only - Oct 4 0:00 0 -
Rule Lebanon 1993 max - Mar lastSun 0:00 1:00 S
Rule Lebanon 1993 1998 - Sep lastSun 0:00 0 -
Rule Lebanon 1999 max - Oct lastSun 0:00 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Beirut 2:22:00 - LMT 1880
2:00 Lebanon EE%sT
# Brunei
# Malaysia (eastern)
#
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule NBorneo 1935 1941 - Sep 14 0:00 0:20 -
Rule NBorneo 1935 1941 - Dec 14 0:00 0 -
#
# For peninsular Malaysia see Asia/Singapore.
#
# Sabah & Sarawak
# From Paul Eggert (2014-08-12):
# The data entries here are mostly from Shanks & Pottenger, but the 1942, 1945
# and 1982 transition dates are from Mok Ly Yng.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Kuching 7:21:20 - LMT 1926 Mar
7:30 - +0730 1933
8:00 NBorneo +08/+0820 1942 Feb 16
9:00 - +09 1945 Sep 12
8:00 - +08
# Maldives
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Indian/Maldives 4:54:00 - LMT 1880 # Malé
4:54:00 - MMT 1960 # Malé Mean Time
5:00 - +05
# Mongolia
# Shanks & Pottenger say that Mongolia has three time zones, but
# The USNO (1995-12-21) and the CIA map Standard Time Zones of the World
# (2005-03) both say that it has just one.
# From Oscar van Vlijmen (1999-12-11):
# General Information Mongolia
# (1999-09)
# "Time: Mongolia has two time zones. Three westernmost provinces of
# Bayan-Ölgii, Uvs, and Hovd are one hour earlier than the capital city, and
# the rest of the country follows the Ulaanbaatar time, which is UTC/GMT plus
# eight hours."
# From Rives McDow (1999-12-13):
# Mongolia discontinued the use of daylight savings time in 1999; 1998
# being the last year it was implemented. The dates of implementation I am
# unsure of, but most probably it was similar to Russia, except for the time
# of implementation may have been different....
# Some maps in the past have indicated that there was an additional time
# zone in the eastern part of Mongolia, including the provinces of Dornod,
# Sükhbaatar, and possibly Khentii.
# From Paul Eggert (1999-12-15):
# Naming and spelling is tricky in Mongolia.
# We'll use Hovd (also spelled Chovd and Khovd) to represent the west zone;
# the capital of the Hovd province is sometimes called Hovd, sometimes Dund-Us,
# and sometimes Jirgalanta (with variant spellings), but the name Hovd
# is good enough for our purposes.
# From Rives McDow (2001-05-13):
# In addition to Mongolia starting daylight savings as reported earlier
# (adopted DST on 2001-04-27 02:00 local time, ending 2001-09-28),
# there are three time zones.
#
# Provinces [at 7:00]: Bayan-Ölgii, Uvs, Khovd, Zavkhan, Govi-Altai
# Provinces [at 8:00]: Khövsgöl, Bulgan, Arkhangai, Khentii, Töv,
# Bayankhongor, Övörkhangai, Dundgovi, Dornogovi, Ömnögovi
# Provinces [at 9:00]: Dornod, Sükhbaatar
#
# [The province of Selenge is omitted from the above lists.]
# From Ganbold Ts., Ulaanbaatar (2004-04-17):
# Daylight saving occurs at 02:00 local time last Saturday of March.
# It will change back to normal at 02:00 local time last Saturday of
# September.... As I remember this rule was changed in 2001.
#
# From Paul Eggert (2004-04-17):
# For now, assume Rives McDow's informant got confused about Friday vs
# Saturday, and that his 2001 dates should have 1 added to them.
# From Paul Eggert (2005-07-26):
# We have wildly conflicting information about Mongolia's time zones.
# Bill Bonnet (2005-05-19) reports that the US Embassy in Ulaanbaatar says
# there is only one time zone and that DST is observed, citing Microsoft
# Windows XP as the source. Risto Nykänen (2005-05-16) reports that
# travelmongolia.org says there are two time zones (UT +07, +08) with no DST.
# Oscar van Vlijmen (2005-05-20) reports that the Mongolian Embassy in
# Washington, DC says there are two time zones, with DST observed.
# He also found
# http://ubpost.mongolnews.mn/index.php?subaction=showcomments&id=1111634894&archive=&start_from=&ucat=1&
# which also says that there is DST, and which has a comment by "Toddius"
# (2005-03-31 06:05 +0700) saying "Mongolia actually has 3.5 time zones.
# The West (OLGII) is +7 GMT, most of the country is ULAT is +8 GMT
# and some Eastern provinces are +9 GMT but Sükhbaatar Aimag is SUHK +8.5 GMT.
# The SUKH timezone is new this year, it is one of the few things the
# parliament passed during the tumultuous winter session."
# For now, let's ignore this information, until we have more confirmation.
# From Ganbold Ts. (2007-02-26):
# Parliament of Mongolia has just changed the daylight-saving rule in February.
# They decided not to adopt daylight-saving time....
# http://www.mongolnews.mn/index.php?module=unuudur&sec=view&id=15742
# From Deborah Goldsmith (2008-03-30):
# We received a bug report claiming that the tz database UTC offset for
# Asia/Choibalsan (GMT+09:00) is incorrect, and that it should be GMT
# +08:00 instead. Different sources appear to disagree with the tz
# database on this, e.g.:
#
# https://www.timeanddate.com/worldclock/city.html?n=1026
# http://www.worldtimeserver.com/current_time_in_MN.aspx
#
# both say GMT+08:00.
# From Steffen Thorsen (2008-03-31):
# eznis airways, which operates several domestic flights, has a flight
# schedule here:
# http://www.eznis.com/Container.jsp?id=112
# (click the English flag for English)
#
# There it appears that flights between Choibalsan and Ulaanbaatar arrive
# about 1:35 - 1:50 hours later in local clock time, no matter the
# direction, while Ulaanbaatar-Khovd takes 2 hours in the Eastern
# direction and 3:35 back, which indicates that Ulaanbaatar and Khovd are
# in different time zones (like we know about), while Choibalsan and
# Ulaanbaatar are in the same time zone (correction needed).
# From Arthur David Olson (2008-05-19):
# Assume that Choibalsan is indeed offset by 8:00.
# XXX--in the absence of better information, assume that transition
# was at the start of 2008-03-31 (the day of Steffen Thorsen's report);
# this is almost surely wrong.
# From Ganbold Tsagaankhuu (2015-03-10):
# It seems like yesterday Mongolian Government meeting has concluded to use
# daylight saving time in Mongolia.... Starting at 2:00AM of last Saturday of
# March 2015, daylight saving time starts. And 00:00AM of last Saturday of
# September daylight saving time ends. Source:
# http://zasag.mn/news/view/8969
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Mongol 1983 1984 - Apr 1 0:00 1:00 -
Rule Mongol 1983 only - Oct 1 0:00 0 -
# Shanks & Pottenger and IATA SSIM say 1990s switches occurred at 00:00,
# but McDow says the 2001 switches occurred at 02:00. Also, IATA SSIM
# (1996-09) says 1996-10-25. Go with Shanks & Pottenger through 1998.
#
# Shanks & Pottenger say that the Sept. 1984 through Sept. 1990 switches
# in Choibalsan (more precisely, in Dornod and Sükhbaatar) took place
# at 02:00 standard time, not at 00:00 local time as in the rest of
# the country. That would be odd, and possibly is a result of their
# correction of 02:00 (in the previous edition) not being done correctly
# in the latest edition; so ignore it for now.
# From Ganbold Tsagaankhuu (2017-02-09):
# Mongolian Government meeting has concluded today to cancel daylight
# saving time adoption in Mongolia. Source: http://zasag.mn/news/view/16192
Rule Mongol 1985 1998 - Mar lastSun 0:00 1:00 -
Rule Mongol 1984 1998 - Sep lastSun 0:00 0 -
# IATA SSIM (1999-09) says Mongolia no longer observes DST.
Rule Mongol 2001 only - Apr lastSat 2:00 1:00 -
Rule Mongol 2001 2006 - Sep lastSat 2:00 0 -
Rule Mongol 2002 2006 - Mar lastSat 2:00 1:00 -
Rule Mongol 2015 2016 - Mar lastSat 2:00 1:00 -
Rule Mongol 2015 2016 - Sep lastSat 0:00 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
# Hovd, a.k.a. Chovd, Dund-Us, Dzhargalant, Khovd, Jirgalanta
Zone Asia/Hovd 6:06:36 - LMT 1905 Aug
6:00 - +06 1978
7:00 Mongol +07/+08
# Ulaanbaatar, a.k.a. Ulan Bataar, Ulan Bator, Urga
Zone Asia/Ulaanbaatar 7:07:32 - LMT 1905 Aug
7:00 - +07 1978
8:00 Mongol +08/+09
# Choibalsan, a.k.a. Bajan Tümen, Bajan Tumen, Chojbalsan,
# Choybalsan, Sanbejse, Tchoibalsan
Zone Asia/Choibalsan 7:38:00 - LMT 1905 Aug
7:00 - +07 1978
8:00 - +08 1983 Apr
9:00 Mongol +09/+10 2008 Mar 31
8:00 Mongol +08/+09
# Nepal
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Kathmandu 5:41:16 - LMT 1920
5:30 - +0530 1986
5:45 - +0545
# Pakistan
# From Rives McDow (2002-03-13):
# I have been advised that Pakistan has decided to adopt dst on a
# TRIAL basis for one year, starting 00:01 local time on April 7, 2002
# and ending at 00:01 local time October 6, 2002. This is what I was
# told, but I believe that the actual time of change may be 00:00; the
# 00:01 was to make it clear which day it was on.
# From Paul Eggert (2002-03-15):
# Jesper Nørgaard found this URL:
# http://www.pak.gov.pk/public/news/app/app06_dec.htm
# (dated 2001-12-06) which says that the Cabinet adopted a scheme "to
# advance the clocks by one hour on the night between the first
# Saturday and Sunday of April and revert to the original position on
# 15th October each year". This agrees with McDow's 04-07 at 00:00,
# but disagrees about the October transition, and makes it sound like
# it's not on a trial basis. Also, the "between the first Saturday
# and Sunday of April" phrase, if taken literally, means that the
# transition takes place at 00:00 on the first Sunday on or after 04-02.
# From Paul Eggert (2003-02-09):
# DAWN reported on 2002-10-05
# that 2002 DST ended that day at midnight. Go with McDow for now.
# From Steffen Thorsen (2003-03-14):
# According to http://www.dawn.com/2003/03/07/top15.htm
# there will be no DST in Pakistan this year:
#
# ISLAMABAD, March 6: Information and Media Development Minister Sheikh
# Rashid Ahmed on Thursday said the cabinet had reversed a previous
# decision to advance clocks by one hour in summer and put them back by
# one hour in winter with the aim of saving light hours and energy.
#
# The minister told a news conference that the experiment had rather
# shown 8 per cent higher consumption of electricity.
# From Alex Krivenyshev (2008-05-15):
#
# Here is an article that Pakistan plan to introduce Daylight Saving Time
# on June 1, 2008 for 3 months.
#
# "... The federal cabinet on Wednesday announced a new conservation plan to
# help reduce load shedding by approving the closure of commercial centres at
# 9pm and moving clocks forward by one hour for the next three months. ...."
#
# http://www.worldtimezone.com/dst_news/dst_news_pakistan01.html
# http://www.dailytimes.com.pk/default.asp?page=2008%5C05%5C15%5Cstory_15-5-2008_pg1_4
# From Arthur David Olson (2008-05-19):
# XXX--midnight transitions is a guess; 2008 only is a guess.
# From Alexander Krivenyshev (2008-08-28):
# Pakistan government has decided to keep the watches one-hour advanced
# for another 2 months - plan to return to Standard Time on October 31
# instead of August 31.
#
# http://www.worldtimezone.com/dst_news/dst_news_pakistan02.html
# http://dailymailnews.com/200808/28/news/dmbrn03.html
# From Alexander Krivenyshev (2009-04-08):
# Based on previous media reports that "... proposed plan to
# advance clocks by one hour from May 1 will cause disturbance
# to the working schedules rather than bringing discipline in
# official working."
# http://www.thenews.com.pk/daily_detail.asp?id=171280
#
# recent news that instead of May 2009 - Pakistan plan to
# introduce DST from April 15, 2009
#
# FYI: Associated Press Of Pakistan
# April 08, 2009
# Cabinet okays proposal to advance clocks by one hour from April 15
# http://www.app.com.pk/en_/index.php?option=com_content&task=view&id=73043&Itemid=1
# http://www.worldtimezone.com/dst_news/dst_news_pakistan05.html
#
# ....
# The Federal Cabinet on Wednesday approved the proposal to
# advance clocks in the country by one hour from April 15 to
# conserve energy"
# From Steffen Thorsen (2009-09-17):
# "The News International," Pakistan reports that: "The Federal
# Government has decided to restore the previous time by moving the
# clocks backward by one hour from October 1. A formal announcement to
# this effect will be made after the Prime Minister grants approval in
# this regard."
# http://www.thenews.com.pk/updates.asp?id=87168
# From Alexander Krivenyshev (2009-09-28):
# According to Associated Press Of Pakistan, it is confirmed that
# Pakistan clocks across the country would be turned back by an hour from
# October 1, 2009.
#
# "Clocks to go back one hour from 1 Oct"
# http://www.app.com.pk/en_/index.php?option=com_content&task=view&id=86715&Itemid=2
# http://www.worldtimezone.com/dst_news/dst_news_pakistan07.htm
#
# From Steffen Thorsen (2009-09-29):
# Now they seem to have changed their mind, November 1 is the new date:
# http://www.thenews.com.pk/top_story_detail.asp?Id=24742
# "The country's clocks will be reversed by one hour on November 1.
# Officials of Federal Ministry for Interior told this to Geo News on
# Monday."
#
# And more importantly, it seems that these dates will be kept every year:
# "It has now been decided that clocks will be wound forward by one hour
# on April 15 and reversed by an hour on November 1 every year without
# obtaining prior approval, the officials added."
#
# We have confirmed this year's end date with both with the Ministry of
# Water and Power and the Pakistan Electric Power Company:
# https://www.timeanddate.com/news/time/pakistan-ends-dst09.html
# From Christoph Göhre (2009-10-01):
# [T]he German Consulate General in Karachi reported me today that Pakistan
# will go back to standard time on 1st of November.
# From Steffen Thorsen (2010-03-26):
# Steffen Thorsen wrote:
# > On Thursday (2010-03-25) it was announced that DST would start in
# > Pakistan on 2010-04-01.
# >
# > Then today, the president said that they might have to revert the
# > decision if it is not supported by the parliament. So at the time
# > being, it seems unclear if DST will be actually observed or not - but
# > April 1 could be a more likely date than April 15.
# Now, it seems that the decision to not observe DST in final:
#
# "Govt Withdraws Plan To Advance Clocks"
# http://www.apakistannews.com/govt-withdraws-plan-to-advance-clocks-172041
#
# "People laud PM's announcement to end DST"
# http://www.app.com.pk/en_/index.php?option=com_content&task=view&id=99374&Itemid=2
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Pakistan 2002 only - Apr Sun>=2 0:00 1:00 S
Rule Pakistan 2002 only - Oct Sun>=2 0:00 0 -
Rule Pakistan 2008 only - Jun 1 0:00 1:00 S
Rule Pakistan 2008 2009 - Nov 1 0:00 0 -
Rule Pakistan 2009 only - Apr 15 0:00 1:00 S
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Karachi 4:28:12 - LMT 1907
5:30 - +0530 1942 Sep
5:30 1:00 +0630 1945 Oct 15
5:30 - +0530 1951 Sep 30
5:00 - +05 1971 Mar 26
5:00 Pakistan PK%sT # Pakistan Time
# Palestine
# From Amos Shapir (1998-02-15):
#
# From 1917 until 1948-05-15, all of Palestine, including the parts now
# known as the Gaza Strip and the West Bank, was under British rule.
# Therefore the rules given for Israel for that period, apply there too...
#
# The Gaza Strip was under Egyptian rule between 1948-05-15 until 1967-06-05
# (except a short occupation by Israel from 1956-11 till 1957-03, but no
# time zone was affected then). It was never formally annexed to Egypt,
# though.
#
# The rest of Palestine was under Jordanian rule at that time, formally
# annexed in 1950 as the West Bank (and the word "Trans" was dropped from
# the country's previous name of "the Hashemite Kingdom of the
# Trans-Jordan"). So the rules for Jordan for that time apply. Major
# towns in that area are Nablus (Shchem), El-Halil (Hebron), Ramallah, and
# East Jerusalem.
#
# Both areas were occupied by Israel in June 1967, but not annexed (except
# for East Jerusalem). They were on Israel time since then; there might
# have been a Military Governor's order about time zones, but I'm not aware
# of any (such orders may have been issued semi-annually whenever summer
# time was in effect, but maybe the legal aspect of time was just neglected).
#
# The Palestinian Authority was established in 1993, and got hold of most
# towns in the West Bank and Gaza by 1995. I know that in order to
# demonstrate...independence, they have been switching to
# summer time and back on a different schedule than Israel's, but I don't
# know when this was started, or what algorithm is used (most likely the
# Jordanian one).
#
# To summarize, the table should probably look something like that:
#
# Area \ when | 1918-1947 | 1948-1967 | 1967-1995 | 1996-
# ------------+-----------+-----------+-----------+-----------
# Israel | Zion | Zion | Zion | Zion
# West bank | Zion | Jordan | Zion | Jordan
# Gaza | Zion | Egypt | Zion | Jordan
#
# I guess more info may be available from the PA's web page (if/when they
# have one).
# From Paul Eggert (2006-03-22):
# Shanks & Pottenger write that Gaza did not observe DST until 1957, but go
# with Shapir and assume that it observed DST from 1940 through 1947,
# and that it used Jordanian rules starting in 1996.
# We don't yet need a separate entry for the West Bank, since
# the only differences between it and Gaza that we know about
# occurred before our cutoff date of 1970.
# However, as we get more information, we may need to add entries
# for parts of the West Bank as they transitioned from Israel's rules
# to Palestine's rules.
# From IINS News Service - Israel - 1998-03-23 10:38:07 Israel time,
# forwarded by Ephraim Silverberg:
#
# Despite the fact that Israel changed over to daylight savings time
# last week, the PLO Authority (PA) has decided not to turn its clocks
# one-hour forward at this time. As a sign of independence from Israeli rule,
# the PA has decided to implement DST in April.
# From Paul Eggert (1999-09-20):
# Daoud Kuttab writes in Holiday havoc
# http://www.jpost.com/com/Archive/22.Apr.1999/Opinion/Article-2.html
# (Jerusalem Post, 1999-04-22) that
# the Palestinian National Authority changed to DST on 1999-04-15.
# I vaguely recall that they switch back in October (sorry, forgot the source).
# For now, let's assume that the spring switch was at 24:00,
# and that they switch at 0:00 on the 3rd Fridays of April and October.
# From Paul Eggert (2005-11-22):
# Starting 2004 transitions are from Steffen Thorsen's web site timeanddate.com.
# From Steffen Thorsen (2005-11-23):
# A user from Gaza reported that Gaza made the change early because of
# the Ramadan. Next year Ramadan will be even earlier, so I think
# there is a good chance next year's end date will be around two weeks
# earlier - the same goes for Jordan.
# From Steffen Thorsen (2006-08-17):
# I was informed by a user in Bethlehem that in Bethlehem it started the
# same day as Israel, and after checking with other users in the area, I
# was informed that they started DST one day after Israel. I was not
# able to find any authoritative sources at the time, nor details if
# Gaza changed as well, but presumed Gaza to follow the same rules as
# the West Bank.
# From Steffen Thorsen (2006-09-26):
# according to the Palestine News Network (2006-09-19):
# http://english.pnn.ps/index.php?option=com_content&task=view&id=596&Itemid=5
# > The Council of Ministers announced that this year its winter schedule
# > will begin early, as of midnight Thursday. It is also time to turn
# > back the clocks for winter. Friday will begin an hour late this week.
# I guess it is likely that next year's date will be moved as well,
# because of the Ramadan.
# From Jesper Nørgaard Welen (2007-09-18):
# According to Steffen Thorsen's web site the Gaza Strip and the rest of the
# Palestinian territories left DST early on 13.th. of September at 2:00.
# From Paul Eggert (2007-09-20):
# My understanding is that Gaza and the West Bank disagree even over when
# the weekend is (Thursday+Friday versus Friday+Saturday), so I'd be a bit
# surprised if they agreed about DST. But for now, assume they agree.
# For lack of better information, predict that future changes will be
# the 2nd Thursday of September at 02:00.
# From Alexander Krivenyshev (2008-08-28):
# Here is an article, that Mideast running on different clocks at Ramadan.
#
# Gaza Strip (as Egypt) ended DST at midnight Thursday (Aug 28, 2008), while
# the West Bank will end Daylight Saving Time at midnight Sunday (Aug 31, 2008).
#
# http://www.guardian.co.uk/world/feedarticle/7759001
# http://www.abcnews.go.com/International/wireStory?id=5676087
# http://www.worldtimezone.com/dst_news/dst_news_gazastrip01.html
# From Alexander Krivenyshev (2009-03-26):
# According to the Palestine News Network (arabic.pnn.ps), Palestinian
# government decided to start Daylight Time on Thursday night March
# 26 and continue until the night of 27 September 2009.
#
# (in Arabic)
# http://arabic.pnn.ps/index.php?option=com_content&task=view&id=50850
#
# (English translation)
# http://www.worldtimezone.com/dst_news/dst_news_westbank01.html
# From Steffen Thorsen (2009-08-31):
# Palestine's Council of Ministers announced that they will revert back to
# winter time on Friday, 2009-09-04.
#
# One news source:
# http://www.safa.ps/ara/?action=showdetail&seid=4158
# (Palestinian press agency, Arabic),
# Google translate: "Decided that the Palestinian government in Ramallah
# headed by Salam Fayyad, the start of work in time for the winter of
# 2009, starting on Friday approved the fourth delay Sept. clock sixty
# minutes per hour as of Friday morning."
#
# We are not sure if Gaza will do the same, last year they had a different
# end date, we will keep this page updated:
# https://www.timeanddate.com/news/time/westbank-gaza-dst-2009.html
# From Alexander Krivenyshev (2009-09-02):
# Seems that Gaza Strip will go back to Winter Time same date as West Bank.
#
# According to Palestinian Ministry Of Interior, West Bank and Gaza Strip plan
# to change time back to Standard time on September 4, 2009.
#
# "Winter time unite the West Bank and Gaza"
# (from Palestinian National Authority):
# http://www.moi.gov.ps/en/?page=633167343250594025&nid=11505
# http://www.worldtimezone.com/dst_news/dst_news_gazastrip02.html
# From Alexander Krivenyshev (2010-03-19):
# According to Voice of Palestine DST will last for 191 days, from March
# 26, 2010 till "the last Sunday before the tenth day of Tishri
# (October), each year" (October 03, 2010?)
#
# http://palvoice.org/forums/showthread.php?t=245697
# (in Arabic)
# http://www.worldtimezone.com/dst_news/dst_news_westbank03.html
# From Steffen Thorsen (2010-03-24):
# ...Ma'an News Agency reports that Hamas cabinet has decided it will
# start one day later, at 12:01am. Not sure if they really mean 12:01am or
# noon though:
#
# http://www.maannews.net/eng/ViewDetails.aspx?ID=271178
# (Ma'an News Agency)
# "At 12:01am Friday, clocks in Israel and the West Bank will change to
# 1:01am, while Gaza clocks will change at 12:01am Saturday morning."
# From Steffen Thorsen (2010-08-11):
# According to several sources, including
# http://www.maannews.net/eng/ViewDetails.aspx?ID=306795
# the clocks were set back one hour at 2010-08-11 00:00:00 local time in
# Gaza and the West Bank.
# Some more background info:
# https://www.timeanddate.com/news/time/westbank-gaza-end-dst-2010.html
# From Steffen Thorsen (2011-08-26):
# Gaza and the West Bank did go back to standard time in the beginning of
# August, and will now enter daylight saving time again on 2011-08-30
# 00:00 (so two periods of DST in 2011). The pause was because of
# Ramadan.
#
# http://www.maannews.net/eng/ViewDetails.aspx?ID=416217
# Additional info:
# https://www.timeanddate.com/news/time/palestine-dst-2011.html
# From Alexander Krivenyshev (2011-08-27):
# According to the article in The Jerusalem Post:
# "...Earlier this month, the Palestinian government in the West Bank decided to
# move to standard time for 30 days, during Ramadan. The Palestinians in the
# Gaza Strip accepted the change and also moved their clocks one hour back.
# The Hamas government said on Saturday that it won't observe summertime after
# the Muslim feast of Id al-Fitr, which begins on Tuesday..."
# ...
# https://www.jpost.com/MiddleEast/Article.aspx?id=235650
# http://www.worldtimezone.com/dst_news/dst_news_gazastrip05.html
# The rules for Egypt are stolen from the 'africa' file.
# From Steffen Thorsen (2011-09-30):
# West Bank did end Daylight Saving Time this morning/midnight (2011-09-30
# 00:00).
# So West Bank and Gaza now have the same time again.
#
# Many sources, including:
# http://www.maannews.net/eng/ViewDetails.aspx?ID=424808
# From Steffen Thorsen (2012-03-26):
# Palestinian news sources tell that both Gaza and West Bank will start DST
# on Friday (Thursday midnight, 2012-03-29 24:00).
# Some of many sources in Arabic:
# http://www.samanews.com/index.php?act=Show&id=122638
#
# http://safa.ps/details/news/74352/%D8%A8%D8%AF%D8%A1-%D8%A7%D9%84%D8%AA%D9%88%D9%82%D9%8A%D8%AA-%D8%A7%D9%84%D8%B5%D9%8A%D9%81%D9%8A-%D8%A8%D8%A7%D9%84%D8%B6%D9%81%D8%A9-%D9%88%D8%BA%D8%B2%D8%A9-%D9%84%D9%8A%D9%84%D8%A9-%D8%A7%D9%84%D8%AC%D9%85%D8%B9%D8%A9.html
#
# Our brief summary:
# https://www.timeanddate.com/news/time/gaza-west-bank-dst-2012.html
# From Steffen Thorsen (2013-03-26):
# The following news sources tells that Palestine will "start daylight saving
# time from midnight on Friday, March 29, 2013" (translated).
# [These are in Arabic and are for Gaza and for Ramallah, respectively.]
# http://www.samanews.com/index.php?act=Show&id=154120
# http://safa.ps/details/news/99844/%D8%B1%D8%A7%D9%85-%D8%A7%D9%84%D9%84%D9%87-%D8%A8%D8%AF%D8%A1-%D8%A7%D9%84%D8%AA%D9%88%D9%82%D9%8A%D8%AA-%D8%A7%D9%84%D8%B5%D9%8A%D9%81%D9%8A-29-%D8%A7%D9%84%D8%AC%D8%A7%D8%B1%D9%8A.html
# From Steffen Thorsen (2013-09-24):
# The Gaza and West Bank are ending DST Thursday at midnight
# (2013-09-27 00:00:00) (one hour earlier than last year...).
# This source in English, says "that winter time will go into effect
# at midnight on Thursday in the West Bank and Gaza Strip":
# http://english.wafa.ps/index.php?action=detail&id=23246
# official source...:
# http://www.palestinecabinet.gov.ps/ar/Views/ViewDetails.aspx?pid=1252
# From Steffen Thorsen (2015-03-03):
# Sources such as http://www.alquds.com/news/article/view/id/548257
# and https://www.raya.ps/ar/news/890705.html say Palestine areas will
# start DST on 2015-03-28 00:00 which is one day later than expected.
#
# From Paul Eggert (2015-03-03):
# https://www.timeanddate.com/time/change/west-bank/ramallah?year=2014
# says that the fall 2014 transition was Oct 23 at 24:00.
# From Hannah Kreitem (2016-03-09):
# http://www.palestinecabinet.gov.ps/WebSite/ar/ViewDetails?ID=31728
# [Google translation]: "The Council also decided to start daylight
# saving in Palestine as of one o'clock on Saturday morning,
# 2016-03-26, to provide the clock 60 minutes ahead."
# From Sharef Mustafa (2016-10-19):
# [T]he Palestinian cabinet decision (Mar 8th 2016) published on
# http://www.palestinecabinet.gov.ps/WebSite/Upload/Decree/GOV_17/16032016134830.pdf
# states that summer time will end on Oct 29th at 01:00.
# From Sharef Mustafa (2018-03-16):
# Palestine summer time will start on Mar 24th 2018 ...
# http://www.palestinecabinet.gov.ps/Website/AR/NDecrees/ViewFile.ashx?ID=e7a42ab7-ee23-435a-b9c8-a4f7e81f3817
# From Even Scharning (2019-03-23):
# http://pnn.ps/news/401130
# http://palweather.ps/ar/node/50136.html
#
# From Sharif Mustafa (2019-03-26):
# The Palestinian cabinet announced today that the switch to DST will
# be on Fri Mar 29th 2019 by advancing the clock by 60 minutes.
# http://palestinecabinet.gov.ps/Website/AR/NDecrees/ViewFile.ashx?ID=e54e9ea1-50ee-4137-84df-0d6c78da259b
#
# From Even Scharning (2019-04-10):
# Our source in Palestine said it happened Friday 29 at 00:00 local time....
# From Sharef Mustafa (2019-10-18):
# Palestine summer time will end on midnight Oct 26th 2019 ...
#
# From Steffen Thorsen (2020-10-20):
# Some sources such as these say, and display on clocks, that DST ended at
# midnight last year...
# https://www.amad.ps/ar/post/320006
#
# From Tim Parenti (2020-10-20):
# The report of the Palestinian Cabinet meeting of 2019-10-14 confirms
# a decision on (translated): "The start of the winter time in Palestine, by
# delaying the clock by sixty minutes, starting from midnight on Friday /
# Saturday corresponding to 26/10/2019."
# http://www.palestinecabinet.gov.ps/portal/meeting/details/43948
# From Sharef Mustafa (2020-10-20):
# As per the palestinian cabinet announcement yesterday , the day light saving
# shall [end] on Oct 24th 2020 at 01:00AM by delaying the clock by 60 minutes.
# http://www.palestinecabinet.gov.ps/portal/Meeting/Details/51584
# From Pierre Cashon (2020-10-20):
# The summer time this year started on March 28 at 00:00.
# https://wafa.ps/ar_page.aspx?id=GveQNZa872839351758aGveQNZ
# http://www.palestinecabinet.gov.ps/portal/meeting/details/50284
# The winter time in 2015 started on October 23 at 01:00.
# https://wafa.ps/ar_page.aspx?id=CgpCdYa670694628582aCgpCdY
# http://www.palestinecabinet.gov.ps/portal/meeting/details/27583
# From P Chan (2021-10-18):
# http://wafa.ps/Pages/Details/34701
# Palestine winter time will start from midnight 2021-10-29 (Thursday-Friday).
#
# From Heba Hemad, Palestine Ministry of Telecom & IT (2021-10-20):
# ... winter time will begin in Palestine from Friday 10-29, 01:00 AM
# by 60 minutes backwards.
#
# From Tim Parenti (2021-10-25), per Paul Eggert (2021-10-24):
# Guess future fall transitions at 01:00 on the Friday preceding October's
# last Sunday (i.e., Fri>=23), as this is more consistent with recent practice.
# From Heba Hamad (2022-03-10):
# summer time will begin in Palestine from Sunday 03-27-2022, 00:00 AM.
# From Heba Hamad (2022-08-30):
# winter time will begin in Palestine from Saturday 10-29, 02:00 AM by
# 60 minutes backwards. Also the state of Palestine adopted the summer
# and winter time for the years: 2023,2024,2025,2026 ...
# https://mm.icann.org/pipermail/tz/attachments/20220830/9f024566/Time-0001.pdf
# (2022-08-31): ... the Saturday before the last Sunday in March and October
# at 2:00 AM ,for the years from 2023 to 2026.
# (2022-09-05): https://mtit.pna.ps/Site/New/1453
#
# From Paul Eggert (2022-08-31):
# For now, assume that this rule will also be used after 2026.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule EgyptAsia 1957 only - May 10 0:00 1:00 S
Rule EgyptAsia 1957 1958 - Oct 1 0:00 0 -
Rule EgyptAsia 1958 only - May 1 0:00 1:00 S
Rule EgyptAsia 1959 1967 - May 1 1:00 1:00 S
Rule EgyptAsia 1959 1965 - Sep 30 3:00 0 -
Rule EgyptAsia 1966 only - Oct 1 3:00 0 -
Rule Palestine 1999 2005 - Apr Fri>=15 0:00 1:00 S
Rule Palestine 1999 2003 - Oct Fri>=15 0:00 0 -
Rule Palestine 2004 only - Oct 1 1:00 0 -
Rule Palestine 2005 only - Oct 4 2:00 0 -
Rule Palestine 2006 2007 - Apr 1 0:00 1:00 S
Rule Palestine 2006 only - Sep 22 0:00 0 -
Rule Palestine 2007 only - Sep 13 2:00 0 -
Rule Palestine 2008 2009 - Mar lastFri 0:00 1:00 S
Rule Palestine 2008 only - Sep 1 0:00 0 -
Rule Palestine 2009 only - Sep 4 1:00 0 -
Rule Palestine 2010 only - Mar 26 0:00 1:00 S
Rule Palestine 2010 only - Aug 11 0:00 0 -
Rule Palestine 2011 only - Apr 1 0:01 1:00 S
Rule Palestine 2011 only - Aug 1 0:00 0 -
Rule Palestine 2011 only - Aug 30 0:00 1:00 S
Rule Palestine 2011 only - Sep 30 0:00 0 -
Rule Palestine 2012 2014 - Mar lastThu 24:00 1:00 S
Rule Palestine 2012 only - Sep 21 1:00 0 -
Rule Palestine 2013 only - Sep 27 0:00 0 -
Rule Palestine 2014 only - Oct 24 0:00 0 -
Rule Palestine 2015 only - Mar 28 0:00 1:00 S
Rule Palestine 2015 only - Oct 23 1:00 0 -
Rule Palestine 2016 2018 - Mar Sat<=30 1:00 1:00 S
Rule Palestine 2016 2018 - Oct Sat<=30 1:00 0 -
Rule Palestine 2019 only - Mar 29 0:00 1:00 S
Rule Palestine 2019 only - Oct Sat<=30 0:00 0 -
Rule Palestine 2020 2021 - Mar Sat<=30 0:00 1:00 S
Rule Palestine 2020 only - Oct 24 1:00 0 -
Rule Palestine 2021 only - Oct 29 1:00 0 -
Rule Palestine 2022 only - Mar 27 0:00 1:00 S
Rule Palestine 2022 max - Oct Sat<=30 2:00 0 -
Rule Palestine 2023 max - Mar Sat<=30 2:00 1:00 S
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Gaza 2:17:52 - LMT 1900 Oct
2:00 Zion EET/EEST 1948 May 15
2:00 EgyptAsia EE%sT 1967 Jun 5
2:00 Zion I%sT 1996
2:00 Jordan EE%sT 1999
2:00 Palestine EE%sT 2008 Aug 29 0:00
2:00 - EET 2008 Sep
2:00 Palestine EE%sT 2010
2:00 - EET 2010 Mar 27 0:01
2:00 Palestine EE%sT 2011 Aug 1
2:00 - EET 2012
2:00 Palestine EE%sT
Zone Asia/Hebron 2:20:23 - LMT 1900 Oct
2:00 Zion EET/EEST 1948 May 15
2:00 EgyptAsia EE%sT 1967 Jun 5
2:00 Zion I%sT 1996
2:00 Jordan EE%sT 1999
2:00 Palestine EE%sT
# Paracel Is
# no information
# Philippines
# From Paul Eggert (2018-11-18):
# The Spanish initially used American (west-of-Greenwich) time.
# It is unknown what time Manila kept when the British occupied it from
# 1762-10-06 through 1764-04; for now assume it kept American time.
# On 1844-08-16, Narciso Clavería, governor-general of the
# Philippines, issued a proclamation announcing that 1844-12-30 was to
# be immediately followed by 1845-01-01; see R.H. van Gent's
# History of the International Date Line
# https://www.staff.science.uu.nl/~gent0113/idl/idl_philippines.htm
# The rest of the data entries are from Shanks & Pottenger.
# From Jesper Nørgaard Welen (2006-04-26):
# ... claims that Philippines had DST last time in 1990:
# http://story.philippinetimes.com/p.x/ct/9/id/145be20cc6b121c0/cid/3e5bbccc730d258c/
# [a story dated 2006-04-25 by Cris Larano of Dow Jones Newswires,
# but no details]
# From Paul Eggert (2014-08-14):
# The following source says DST may be instituted November-January and again
# March-June, but this is not definite. It also says DST was last proclaimed
# during the Ramos administration (1992-1998); but again, no details.
# Carcamo D. PNoy urged to declare use of daylight saving time.
# Philippine Star 2014-08-05
# http://www.philstar.com/headlines/2014/08/05/1354152/pnoy-urged-declare-use-daylight-saving-time
# From Paul Goyette (2018-06-15):
# In the Philippines, there is a national law, Republic Act No. 10535
# which declares the official time here as "Philippine Standard Time".
# The act [1] even specifies use of PST as the abbreviation, although
# the FAQ provided by PAGASA [2] uses the "acronym PhST to distinguish
# it from the Pacific Standard Time (PST)."
# [1] http://www.officialgazette.gov.ph/2013/05/15/republic-act-no-10535/
# [2] https://www1.pagasa.dost.gov.ph/index.php/astronomy/philippine-standard-time#republic-act-10535
#
# From Paul Eggert (2018-06-19):
# I surveyed recent news reports, and my impression is that "PST" is
# more popular among reliable English-language news sources. This is
# not just a measure of Google hit counts: it's also the sizes and
# influence of the sources. There is no current abbreviation for DST,
# so use "PDT", the usual American style.
# From P Chan (2021-05-10):
# Here's a fairly comprehensive article in Japanese:
# https://wiki.suikawiki.org/n/Philippine%20Time
# From Paul Eggert (2021-05-10):
# The info in the Japanese table has not been absorbed (yet) below.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Phil 1936 only - Nov 1 0:00 1:00 D
Rule Phil 1937 only - Feb 1 0:00 0 S
Rule Phil 1954 only - Apr 12 0:00 1:00 D
Rule Phil 1954 only - Jul 1 0:00 0 S
Rule Phil 1978 only - Mar 22 0:00 1:00 D
Rule Phil 1978 only - Sep 21 0:00 0 S
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Manila -15:56:00 - LMT 1844 Dec 31
8:04:00 - LMT 1899 May 11
8:00 Phil P%sT 1942 May
9:00 - JST 1944 Nov
8:00 Phil P%sT
# Bahrain
# Qatar
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Qatar 3:26:08 - LMT 1920 # Al Dawhah / Doha
4:00 - +04 1972 Jun
3:00 - +03
# Kuwait
# Saudi Arabia
# Yemen
#
# Japan's year-round bases in Antarctica match this since 1970.
#
# From Paul Eggert (2018-08-29):
# Time in Saudi Arabia and other countries in the Arabian peninsula was not
# standardized until 1968 or so; we don't know exactly when, and possibly it
# has never been made official. Richard P Hunt, in "Islam city yielding to
# modern times", New York Times (1961-04-09), p 20, wrote that only airlines
# observed standard time, and that people in Jeddah mostly observed quasi-solar
# time, doing so by setting their watches at sunrise to 6 o'clock (or to 12
# o'clock for "Arab" time).
#
# Timekeeping differed depending on who you were and which part of Saudi
# Arabia you were in. In 1969, Elias Antar wrote that although a common
# practice had been to set one's watch to 12:00 (i.e., midnight) at sunset -
# which meant that the time on one side of a mountain could differ greatly from
# the time on the other side - many foreigners set their watches to 6pm
# instead, while airlines instead used UTC +03 (except in Dhahran, where they
# used UTC +04), Aramco used UTC +03 with DST, and the Trans-Arabian Pipe Line
# Company used Aramco time in eastern Saudi Arabia and airline time in western.
# (The American Military Aid Advisory Group used plain UTC.) Antar writes,
# "A man named Higgins, so the story goes, used to run a local power
# station. One day, the whole thing became too much for Higgins and he
# assembled his staff and laid down the law. 'I've had enough of this,' he
# shrieked. 'It is now 12 o'clock Higgins Time, and from now on this station is
# going to run on Higgins Time.' And so, until last year, it did." See:
# Antar E. Dinner at When? Saudi Aramco World, 1969 March/April. 2-3.
# http://archive.aramcoworld.com/issue/196902/dinner.at.when.htm
# Also see: Antar EN. Arabian flying is confusing.
# Port Angeles (WA) Evening News. 1965-03-10. page 3.
#
# The TZ database cannot represent quasi-solar time; airline time is the best
# we can do. The 1946 foreign air news digest of the U.S. Civil Aeronautics
# Board (OCLC 42299995) reported that the "... Arabian Government, inaugurated
# a weekly Dhahran-Cairo service, via the Saudi Arabian cities of Riyadh and
# Jidda, on March 14, 1947". Shanks & Pottenger guessed 1950; go with the
# earlier date.
#
# Shanks & Pottenger also state that until 1968-05-01 Saudi Arabia had two
# time zones; the other zone, at UT +04, was in the far eastern part of
# the country. Presumably this is documenting airline time. Ignore this,
# as it's before our 1970 cutoff.
#
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Riyadh 3:06:52 - LMT 1947 Mar 14
3:00 - +03
# Singapore
# taken from Mok Ly Yng (2003-10-30)
# https://web.archive.org/web/20190822231045/http://www.math.nus.edu.sg/~mathelmr/teaching/timezone.html
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Singapore 6:55:25 - LMT 1901 Jan 1
6:55:25 - SMT 1905 Jun 1 # Singapore M.T.
7:00 - +07 1933 Jan 1
7:00 0:20 +0720 1936 Jan 1
7:20 - +0720 1941 Sep 1
7:30 - +0730 1942 Feb 16
9:00 - +09 1945 Sep 12
7:30 - +0730 1981 Dec 31 16:00u
8:00 - +08
# Spratly Is
# no information
# Sri Lanka
# From Paul Eggert (2013-02-21):
# Milne says "Madras mean time use from May 1, 1898. Prior to this Colombo
# mean time, 5h. 4m. 21.9s. F., was used." But 5:04:21.9 differs considerably
# from Colombo's meridian 5:19:24, so for now ignore Milne and stick with
# Shanks and Pottenger.
# From Paul Eggert (1996-09-03):
# "Sri Lanka advances clock by an hour to avoid blackout"
# (, 1996-05-24,
# no longer available as of 1999-08-17)
# reported "the country's standard time will be put forward by one hour at
# midnight Friday (1830 GMT) 'in the light of the present power crisis'."
#
# From Dharmasiri Senanayake, Sri Lanka Media Minister (1996-10-24), as quoted
# by Shamindra in Daily News - Hot News Section
# (1996-10-26):
# With effect from 12.30 a.m. on 26th October 1996
# Sri Lanka will be six (06) hours ahead of GMT.
# From Jesper Nørgaard Welen (2006-04-14), quoting Sri Lanka News Online
# (2006-04-13):
# 0030 hrs on April 15, 2006 (midnight of April 14, 2006 +30 minutes)
# at present, become 2400 hours of April 14, 2006 (midnight of April 14, 2006).
# From Peter Apps and Ranga Sirila of Reuters (2006-04-12) in:
# http://today.reuters.co.uk/news/newsArticle.aspx?type=scienceNews&storyID=2006-04-12T172228Z_01_COL295762_RTRIDST_0_SCIENCE-SRILANKA-TIME-DC.XML
# [The Tamil Tigers] never accepted the original 1996 time change and simply
# kept their clocks set five and a half hours ahead of Greenwich Mean
# Time (GMT), in line with neighbor India.
# From Paul Eggert (2006-04-18):
# People who live in regions under Tamil control can use [TZ='Asia/Kolkata'],
# as that zone has agreed with the Tamil areas since our cutoff date of 1970.
# From Sadika Sumanapala (2016-10-19):
# According to http://www.sltime.org (maintained by Measurement Units,
# Standards & Services Department, Sri Lanka) abbreviation for Sri Lanka
# standard time is SLST.
#
# From Paul Eggert (2016-10-18):
# "SLST" seems to be reasonably recent and rarely used outside time
# zone nerd sources. I searched Google News and found three uses of
# it in the International Business Times of India in February and
# March of this year when discussing cricket match times, but nothing
# since then (though there has been a lot of cricket) and nothing in
# other English-language news sources. Our old abbreviation "LKT" is
# even worse. For now, let's use a numeric abbreviation; we can
# switch to "SLST" if it catches on.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Colombo 5:19:24 - LMT 1880
5:19:32 - MMT 1906 # Moratuwa Mean Time
5:30 - +0530 1942 Jan 5
5:30 0:30 +06 1942 Sep
5:30 1:00 +0630 1945 Oct 16 2:00
5:30 - +0530 1996 May 25 0:00
6:30 - +0630 1996 Oct 26 0:30
6:00 - +06 2006 Apr 15 0:30
5:30 - +0530
# Syria
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Syria 1920 1923 - Apr Sun>=15 2:00 1:00 S
Rule Syria 1920 1923 - Oct Sun>=1 2:00 0 -
Rule Syria 1962 only - Apr 29 2:00 1:00 S
Rule Syria 1962 only - Oct 1 2:00 0 -
Rule Syria 1963 1965 - May 1 2:00 1:00 S
Rule Syria 1963 only - Sep 30 2:00 0 -
Rule Syria 1964 only - Oct 1 2:00 0 -
Rule Syria 1965 only - Sep 30 2:00 0 -
Rule Syria 1966 only - Apr 24 2:00 1:00 S
Rule Syria 1966 1976 - Oct 1 2:00 0 -
Rule Syria 1967 1978 - May 1 2:00 1:00 S
Rule Syria 1977 1978 - Sep 1 2:00 0 -
Rule Syria 1983 1984 - Apr 9 2:00 1:00 S
Rule Syria 1983 1984 - Oct 1 2:00 0 -
Rule Syria 1986 only - Feb 16 2:00 1:00 S
Rule Syria 1986 only - Oct 9 2:00 0 -
Rule Syria 1987 only - Mar 1 2:00 1:00 S
Rule Syria 1987 1988 - Oct 31 2:00 0 -
Rule Syria 1988 only - Mar 15 2:00 1:00 S
Rule Syria 1989 only - Mar 31 2:00 1:00 S
Rule Syria 1989 only - Oct 1 2:00 0 -
Rule Syria 1990 only - Apr 1 2:00 1:00 S
Rule Syria 1990 only - Sep 30 2:00 0 -
Rule Syria 1991 only - Apr 1 0:00 1:00 S
Rule Syria 1991 1992 - Oct 1 0:00 0 -
Rule Syria 1992 only - Apr 8 0:00 1:00 S
Rule Syria 1993 only - Mar 26 0:00 1:00 S
Rule Syria 1993 only - Sep 25 0:00 0 -
# IATA SSIM (1998-02) says 1998-04-02;
# (1998-09) says 1999-03-29 and 1999-09-29; (1999-02) says 1999-04-02,
# 2000-04-02, and 2001-04-02; (1999-09) says 2000-03-31 and 2001-03-31;
# (2006) says 2006-03-31 and 2006-09-22;
# for now ignore all these claims and go with Shanks & Pottenger,
# except for the 2006-09-22 claim (which seems right for Ramadan).
Rule Syria 1994 1996 - Apr 1 0:00 1:00 S
Rule Syria 1994 2005 - Oct 1 0:00 0 -
Rule Syria 1997 1998 - Mar lastMon 0:00 1:00 S
Rule Syria 1999 2006 - Apr 1 0:00 1:00 S
# From Stephen Colebourne (2006-09-18):
# According to IATA data, Syria will change DST on 21st September [21:00 UTC]
# this year [only].... This is probably related to Ramadan, like Egypt.
Rule Syria 2006 only - Sep 22 0:00 0 -
# From Paul Eggert (2007-03-29):
# Today the AP reported "Syria will switch to summertime at midnight Thursday."
# http://www.iht.com/articles/ap/2007/03/29/africa/ME-GEN-Syria-Time-Change.php
Rule Syria 2007 only - Mar lastFri 0:00 1:00 S
# From Jesper Nørgaard (2007-10-27):
# The sister center ICARDA of my work CIMMYT is confirming that Syria DST will
# not take place 1st November at 0:00 o'clock but 1st November at 24:00 or
# rather Midnight between Thursday and Friday. This does make more sense than
# having it between Wednesday and Thursday (two workdays in Syria) since the
# weekend in Syria is not Saturday and Sunday, but Friday and Saturday. So now
# it is implemented at midnight of the last workday before weekend...
#
# From Steffen Thorsen (2007-10-27):
# Jesper Nørgaard Welen wrote:
#
# > "Winter local time in Syria will be observed at midnight of Thursday 1
# > November 2007, and the clock will be put back 1 hour."
#
# I found confirmation on this in this gov.sy-article (Arabic):
# http://wehda.alwehda.gov.sy/_print_veiw.asp?FileName=12521710520070926111247
#
# which using Google's translate tools says:
# Council of Ministers also approved the commencement of work on
# identifying the winter time as of Friday, 2/11/2007 where the 60th
# minute delay at midnight Thursday 1/11/2007.
Rule Syria 2007 only - Nov Fri>=1 0:00 0 -
# From Stephen Colebourne (2008-03-17):
# For everyone's info, I saw an IATA time zone change for [Syria] for
# this month (March 2008) in the last day or so....
# Country Time Standard --- DST Start --- --- DST End --- DST
# Name Zone Variation Time Date Time Date
# Variation
# Syrian Arab
# Republic SY +0200 2200 03APR08 2100 30SEP08 +0300
# 2200 02APR09 2100 30SEP09 +0300
# 2200 01APR10 2100 30SEP10 +0300
# From Arthur David Olson (2008-03-17):
# Here's a link to English-language coverage by the Syrian Arab News
# Agency (SANA)...
# http://www.sana.sy/eng/21/2008/03/11/165173.htm
# ...which reads (in part) "The Cabinet approved the suggestion of the
# Ministry of Electricity to begin daylight savings time on Friday April
# 4th, advancing clocks one hour ahead on midnight of Thursday April 3rd."
# Since Syria is two hours east of UTC, the 2200 and 2100 transition times
# shown above match up with midnight in Syria.
# From Arthur David Olson (2008-03-18):
# My best guess at a Syrian rule is "the Friday nearest April 1";
# coding that involves either using a "Mar Fri>=29" construct that old time zone
# compilers can't handle or having multiple Rules (a la Israel).
# For now, use "Apr Fri>=1", and go with IATA on a uniform Sep 30 end.
# From Steffen Thorsen (2008-10-07):
# Syria has now officially decided to end DST on 2008-11-01 this year,
# according to the following article in the Syrian Arab News Agency (SANA).
#
# The article is in Arabic, and seems to tell that they will go back to
# winter time on 2008-11-01 at 00:00 local daylight time (delaying/setting
# clocks back 60 minutes).
#
# http://sana.sy/ara/2/2008/10/07/195459.htm
# From Steffen Thorsen (2009-03-19):
# Syria will start DST on 2009-03-27 00:00 this year according to many sources,
# two examples:
#
# http://www.sana.sy/eng/21/2009/03/17/217563.htm
# (English, Syrian Arab News # Agency)
# http://thawra.alwehda.gov.sy/_View_news2.asp?FileName=94459258720090318012209
# (Arabic, gov-site)
#
# We have not found any sources saying anything about when DST ends this year.
#
# Our summary
# https://www.timeanddate.com/news/time/syria-dst-starts-march-27-2009.html
# From Steffen Thorsen (2009-10-27):
# The Syrian Arab News Network on 2009-09-29 reported that Syria will
# revert back to winter (standard) time on midnight between Thursday
# 2009-10-29 and Friday 2009-10-30:
# http://www.sana.sy/ara/2/2009/09/29/247012.htm (Arabic)
# From Arthur David Olson (2009-10-28):
# We'll see if future DST switching times turn out to be end of the last
# Thursday of the month or the start of the last Friday of the month or
# something else. For now, use the start of the last Friday.
# From Steffen Thorsen (2010-03-17):
# The "Syrian News Station" reported on 2010-03-16 that the Council of
# Ministers has decided that Syria will start DST on midnight Thursday
# 2010-04-01: (midnight between Thursday and Friday):
# http://sns.sy/sns/?path=news/read/11421 (Arabic)
# From Steffen Thorsen (2012-03-26):
# Today, Syria's government announced that they will start DST early on Friday
# (00:00). This is a bit earlier than the past two years.
#
# From Syrian Arab News Agency, in Arabic:
# http://www.sana.sy/ara/2/2012/03/26/408215.htm
#
# Our brief summary:
# https://www.timeanddate.com/news/time/syria-dst-2012.html
# From Steffen Thorsen (2022-10-05):
# Syria is adopting year-round DST, starting this autumn....
# From https://www.enabbaladi.net/archives/607812
# "This [the decision] came after the weekly government meeting today,
# Tuesday 4 October ..."
#
# From Paul Eggert (2022-10-05):
# Like Jordan, model this as a transition from EEST +03 (DST) to plain +03
# (non-DST) at the point where DST would otherwise have ended.
Rule Syria 2008 only - Apr Fri>=1 0:00 1:00 S
Rule Syria 2008 only - Nov 1 0:00 0 -
Rule Syria 2009 only - Mar lastFri 0:00 1:00 S
Rule Syria 2010 2011 - Apr Fri>=1 0:00 1:00 S
Rule Syria 2012 2022 - Mar lastFri 0:00 1:00 S
Rule Syria 2009 2022 - Oct lastFri 0:00 0 -
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Damascus 2:25:12 - LMT 1920 # Dimashq
2:00 Syria EE%sT 2022 Oct 28 0:00
3:00 - +03
# Tajikistan
# From Shanks & Pottenger.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Dushanbe 4:35:12 - LMT 1924 May 2
5:00 - +05 1930 Jun 21
6:00 RussiaAsia +06/+07 1991 Mar 31 2:00s
5:00 1:00 +06 1991 Sep 9 2:00s
5:00 - +05
# Cambodia
# Christmas I
# Laos
# Thailand
# Vietnam (northern)
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Bangkok 6:42:04 - LMT 1880
6:42:04 - BMT 1920 Apr # Bangkok Mean Time
7:00 - +07
# Turkmenistan
# From Shanks & Pottenger.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Ashgabat 3:53:32 - LMT 1924 May 2 # or Ashkhabad
4:00 - +04 1930 Jun 21
5:00 RussiaAsia +05/+06 1991 Mar 31 2:00
4:00 RussiaAsia +04/+05 1992 Jan 19 2:00
5:00 - +05
# Oman
# Réunion
# Seychelles
# United Arab Emirates
#
# The Crozet Is also observe Réunion time; see the 'antarctica' file.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Dubai 3:41:12 - LMT 1920
4:00 - +04
# Uzbekistan
# Byalokoz 1919 says Uzbekistan was 4:27:53.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Samarkand 4:27:53 - LMT 1924 May 2
4:00 - +04 1930 Jun 21
5:00 - +05 1981 Apr 1
5:00 1:00 +06 1981 Oct 1
6:00 - +06 1982 Apr 1
5:00 RussiaAsia +05/+06 1992
5:00 - +05
# Milne says Tashkent was 4:37:10.8.
#STDOFF 4:37:10.8
Zone Asia/Tashkent 4:37:11 - LMT 1924 May 2
5:00 - +05 1930 Jun 21
6:00 RussiaAsia +06/+07 1991 Mar 31 2:00
5:00 RussiaAsia +05/+06 1992
5:00 - +05
# Vietnam (southern)
# From Paul Eggert (2014-10-04):
# Milne gives 7:16:56 for the meridian of Saigon in 1899, as being
# used in Lower Laos, Cambodia, and Annam. But this is quite a ways
# from Saigon's location. For now, ignore this and stick with Shanks
# and Pottenger for LMT before 1906.
# From Arthur David Olson (2008-03-18):
# The English-language name of Vietnam's most populous city is "Ho Chi Minh
# City"; use Ho_Chi_Minh below to avoid a name of more than 14 characters.
# From Paul Eggert (2022-07-27) after a 2014 heads-up from Trần Ngọc Quân:
# Trần Tiến Bình's authoritative book "Lịch Việt Nam: thế kỷ XX-XXI (1901-2100)"
# (Nhà xuất bản Văn Hoá - Thông Tin, Hanoi, 2005), pp 49-50,
# is quoted verbatim in:
# http://www.thoigian.com.vn/?mPage=P80D01
# is translated by Brian Inglis in:
# https://mm.icann.org/pipermail/tz/2014-October/021654.html
# and is the basis for the information below.
#
# The 1906 transition was effective July 1 and standardized Indochina to
# Phù Liễn Observatory, legally 104° 17' 17" east of Paris.
# It's unclear whether this meant legal Paris Mean Time (00:09:21) or
# the Paris Meridian; for now guess the former and round the exact
# 07:06:30.1333... to 07:06:30.13 as the legal spec used 66 2/3 ms precision.
# which is used below even though the modern-day Phù Liễn Observatory
# is closer to 07:06:31. Abbreviate Phù Liễn Mean Time as PLMT.
#
# The following transitions occurred in Indochina in general (before 1954)
# and in South Vietnam in particular (after 1954):
# To 07:00 on 1911-05-01.
# To 08:00 on 1942-12-31 at 23:00.
# To 09:00 on 1945-03-14 at 23:00.
# To 07:00 on 1945-09-02 in Vietnam.
# To 08:00 on 1947-04-01 in French-controlled Indochina.
# To 07:00 on 1955-07-01 in South Vietnam.
# To 08:00 on 1959-12-31 at 23:00 in South Vietnam.
# To 07:00 on 1975-06-13 in South Vietnam.
#
# Trần cites the following sources; it's unclear which supplied the info above.
#
# Hoàng Xuân Hãn: "Lịch và lịch Việt Nam". Tập san Khoa học Xã hội,
# No. 9, Paris, February 1982.
#
# Lê Thành Lân: "Lịch và niên biểu lịch sử hai mươi thế kỷ (0001-2010)",
# NXB Thống kê, Hanoi, 2000.
#
# Lê Thành Lân: "Lịch hai thế kỷ (1802-2010) và các lịch vĩnh cửu",
# NXB Thuận Hoá, Huế, 1995.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
#STDOFF 7:06:30.13
Zone Asia/Ho_Chi_Minh 7:06:30 - LMT 1906 Jul 1
7:06:30 - PLMT 1911 May 1 # Phù Liễn MT
7:00 - +07 1942 Dec 31 23:00
8:00 - +08 1945 Mar 14 23:00
9:00 - +09 1945 Sep 2
7:00 - +07 1947 Apr 1
8:00 - +08 1955 Jul 1
7:00 - +07 1959 Dec 31 23:00
8:00 - +08 1975 Jun 13
7:00 - +07
# From Paul Eggert (2019-02-19):
#
# The Ho Chi Minh entry suffices for most purposes as it agrees with all of
# Vietnam since 1975-06-13. Presumably clocks often changed in south Vietnam
# in the early 1970s as locations changed hands during the war; however the
# details are unknown and would likely be too voluminous for this database.
#
# For timestamps in north Vietnam back to 1970 (the tzdb cutoff),
# use Asia/Bangkok; see the VN entries in the file zone1970.tab.
# For timestamps before 1970, see Asia/Hanoi in the file 'backzone'.