BEGIN:VCALENDAR
VERSION:2.0
PRODID:
BEGIN:VEVENT
DTSTAMP:
UID:
DTSTART;VALUE=DATE:20200329
SUMMARY:Daylight Saving Time begins (CEST)
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
END:VEVENT
END:VCALENDAR