it is possible to refer to February 29.
:samp:`M{m}.{n}.{d}`
- The *d*'th day (0 <= *d* <= 6) or week *n* of month *m* of the year (1
+ The *d*'th day (0 <= *d* <= 6) of week *n* of month *m* of the year (1
<= *n* <= 5, 1 <= *m* <= 12, where week 5 means "the last *d* day in
month *m*" which may occur in either the fourth or the fifth
week). Week 1 is the first week in which the *d*'th day occurs. Day
- zero is Sunday.
+ zero is a Sunday.
``time`` has the same format as ``offset`` except that no leading sign
('-' or '+') is allowed. The default, if time is not given, is 02:00:00.