BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:-//Ximian//NONSGML Evolution Calendar//EN
BEGIN:VTIMEZONE
TZID:mytestzone
BEGIN:STANDARD
TZNAME:CET
DTSTART:19701028T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19700325T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:20181129T142636Z-11617-1000-1-0@pool-4-4
DTSTAMP:20181129T092002Z
DTSTART;TZID=mytestzone:20181213T233000
DTEND;TZID=mytestzone:20181217T193000
SEQUENCE:2
SUMMARY:shows up on two days
END:VEVENT
END:VCALENDAR