On May 31, 2008, at 3:02 PM, Dave wrote:

> If I create an event with a RRULE:FREQ=YEARLY;BYMONTHDAY=21 recurrence
> rule, Google Calendar shows the event occurring every month.

> DTSTART;VALUE=DATE:20080321
> DTEND;VALUE=DATE:20080322
> RRULE:FREQ=YEARLY;COUNT=51;BYMONTHDAY=21

> Look at it in Google Calendar.  You'll see the event occurring on the
> 21st of each month.  It should repeat yearly.

Google has followed RFC2445 here:

BYxxx rule parts for a period of time less than the frequency  
generally increase or expand the number of occurrences of the  
recurrence. For example, "FREQ=YEARLY;BYMONTH=1,2" increases the  
number of days within the yearly recurrence set from 1 (if BYMONTH tag  
is not present) to 2.
http://tools.ietf.org/html/rfc2445#section-4.3.10
Ray





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