BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//PIMUTILS.ORG//NONSGML khal / icalendar //EN
BEGIN:VEVENT
SUMMARY:This event is invalid but should still be supported by khal
DTSTART;TZID=Europe/Berlin;VALUE=DATE-TIME:20140409T093000
DTEND;TZID=Europe/Berlin;VALUE=DATE-TIME:20140409T103000
UID:invalidRRULEUNTIL2
RRULE:FREQ=WEEKLY;UNTIL=20141205
END:VEVENT
END:VCALENDAR