BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//gyrobase/iCalendar//NONSGML v1.0//EN
BEGIN:VEVENT
DTSTART:20111115T190000
DTEND:20111115T210000
RRULE:FREQ=MONTHLY;INTERVAL=1;UNTIL=20130617;BYDAY=3TU
SUMMARY:Third Tuesday Trope
END:VEVENT
END:VCALENDAR