[patch] entering an invalid day of month for DateField and DateTimeField fields results in NULL value

[Gary Wilson <gary.wilson@…>]

If you try to enter a date where the day is out of range for the month, like 2006-11-31, django will try to insert a NULL value for that field. These dates get past the isValidANSIDate validator's regular expression. Maybe it would be best to use another validator that uses datetime, as it knows that this is an invalid date...

>>> datetime.datetime(2006,11,31)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ValueError: day is out of range for month

and isValidANSIDate could use a simpler regular expression that just checks for a YYYY-MM-DD format.

[Malcolm Tredinnick]

(In [3815]) Fixed #2674 -- Added stricter date validation so that things like 2006-11-31
are caught. Thanks, Gary Wilson.