BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//gyrobase/iCalendar//NONSGML v1.0//EN
BEGIN:VEVENT
DTSTART:20121207
RRULE:FREQ=MONTHLY;INTERVAL=1;UNTIL=20140520;BYDAY=1FR
SUMMARY:Dginn
END:VEVENT
END:VCALENDAR