BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
BEGIN:VEVENT
DTSTART;TZID=US-Eastern:19970902T090000
DURATION:PT24H
EXDATE;TZID=US-Eastern:19970902T090000
RRULE:FREQ=MONTHLY;BYDAY=FR;BYMONTHDAY=13
SUMMARY:Every Friday the 13th
END:VEVENT
END:VCALENDAR