BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//gyrobase/iCalendar//NONSGML v1.0//EN
BEGIN:VEVENT
DTSTART:20110819T203000
RRULE:FREQ=MONTHLY;INTERVAL=1;UNTIL=20140518;BYDAY=3FR
SUMMARY:Sky Watch
END:VEVENT
END:VCALENDAR