BEGIN:VCALENDAR
CALSCALE:GREGORIAN
X-WR-TIMEZONE;VALUE=TEXT:Europe/Zurich
METHOD:PUBLISH
VERSION:2.0
BEGIN:VEVENT
DTSTART;TZID=Europe/Zurich:20130523T200500
SUMMARY:Yoga Flow
DTEND;TZID=Europe/Zurich:20130523T212000
BEGIN:VALARM
TRIGGER;VALUE=DURATION:-P1D
ACTION:DISPLAY
DESCRIPTION:Yoga Flow
END:VALARM
END:VEVENT
END:VCALENDAR