Fixed #3146: DateFields no longer barf when confronted by strings. Thanks, Deepak Thukral.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6193 bcc190cf-cafb-0310-a4f2-bffc1f526a37

AUTHORS

@@ -278,6 +278,7 @@ answer newbie questions, and generally made Django that much better:
     Frank Tegtmeyer <fte@fte.to>
     thebjorn <bp@datakortet.no>
     Zach Thompson <zthompson47@gmail.com>
+    Deepak Thukral <deep.thukral@gmail.com>
     tibimicu@gmax.net
     tobias@neuyork.de
     Tom Tobin

django/db/models/fields/__init__.py

@@ -538,7 +538,12 @@ class DateField(Field):
     def get_db_prep_save(self, value):
         # Casts dates into string format for entry into database.
         if value is not None:
+            try:
                 value = value.strftime('%Y-%m-%d')
+            except AttributeError:
+                # If value is already a string it won't have a strftime method,
+                # so we'll just let it pass through.
+                pass
         return Field.get_db_prep_save(self, value)
 
     def get_manipulator_field_objs(self):