BEGIN:VCALENDAR
VERSION:2.0
PRODID:collective/icalendar
BEGIN:VTIMEZONE
TZID:(UTC-03:00) Brasília
BEGIN:STANDARD
TZNAME:Brasília standard
DTSTART:16010101T235959
TZOFFSETFROM:-0200
TZOFFSETTO:-0300
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=3SA;BYMONTH=2
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:Brasília daylight
DTSTART:16010101T235959
TZOFFSETFROM:-0300
TZOFFSETTO:-0200
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SA;BYMONTH=10
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID="(UTC-03:00) Brasília":20170511T133000
DTEND;TZID="(UTC-03:00) Brasília":20170511T140000
DTSTAMP:16010101T235959
UID:123456
END:VEVENT
END:VCALENDAR