BEGIN:VCALENDAR
BEGIN:VTIMEZONE
TZID:fictional, nonexistent, arbitrary
BEGIN:STANDARD
DTSTART:20100101T000000
TZOFFSETFROM:+0200
TZOFFSETTO:-0200
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=01
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:20101201T000000
TZOFFSETFROM:-0200
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
SUMMARY:standardtime
DTSTART;TZID="fictional, nonexistent, arbitrary":20120115T120000
DTEND;TZID="fictional, nonexistent, arbitrary":20120115T123000
END:VEVENT
BEGIN:VEVENT
SUMMARY:daylightsavingtime
DTSTART;TZID="fictional, nonexistent, arbitrary":20121215T120000
DTEND;TZID="fictional, nonexistent, arbitrary":20121215T123000
END:VEVENT
END:VCALENDAR