BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//EGroupware//NONSGML EGroupware Calendar 17.1.003//DE
BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:19700329T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:19701025T030000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
SUMMARY:test
DTSTART;TZID=Europe/Berlin:20181224T120000
DTEND;TZID=Europe/Berlin:20181224T130000
RRULE:FREQ=DAILY;UNTIL=20181228T110000Z
PRIORITY:5
UID:calendar-509-019ebedc8c54ed2eb2cebd5dc3979f21
SEQUENCE:1
STATUS:CONFIRMED
CREATED:20181221T074538Z
LAST-MODIFIED:20181221T074923Z
DTSTAMP:20181221T075223Z
END:VEVENT
END:VCALENDAR