BEGIN:VCALENDAR
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VERSION:2.0
METHOD:PUBLISH
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TZID:Eastern Time (US & Canada)
BEGIN:STANDARD
DTSTART:20081102T020000
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:Standard Time
END:STANDARD
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DTSTART:20090308T020000
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TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:Daylight Savings Time
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BEGIN:VEVENT
ORGANIZER:MAILTO:a@b.c
DTSTART;TZID="Eastern Time (US & Canada)":20090401T160000
DTEND;TZID="Eastern Time (US & Canada)":20090401T170000
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=SU,MO,TU,WE,TH,FR,SA;BYMONTH=4;BYSETPOS=1;WKST
 =SU
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UID:040000008200E00074C5B7101A82E0080000000070A8874A496FC9010000000000000000100
 0000008BFFD692EFE6B418613BE896DDFBD82
DTSTAMP:20090105T202149Z
SUMMARY:OL16 Yearly the first day of April
PRIORITY:5
X-MICROSOFT-CDO-IMPORTANCE:1
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR