Ticket #3172: datetime_validation_fix_and_tests.patch

django_src/django/db/models/fields/__init__.py

@@ -437 +437 @@
         Field.__init__(self, verbose_name, name, **kwargs)
 
     def to_python(self, value):
+        if value is None:
+            return value
         if isinstance(value, datetime.datetime):
             return value.date()
         if isinstance(value, datetime.date):
@@ -499 +501 @@
 
 class DateTimeField(DateField):
     def to_python(self, value):
+        if value is None:
+            return value
         if isinstance(value, datetime.datetime):
             return value
         if isinstance(value, datetime.date):

django_src/tests/modeltests/validation/models.py

@@ -146 +146 @@
 >>> p.validate()
 {'email': ['Enter a valid e-mail address.']}
 
+# Make sure that Date and DateTime return validation errors and don't raise Python errors.
+>>> Person(name='John Doe', is_child=True, email='abc@def.com').validate()
+{'favorite_moment': ['This field is required.'], 'birthdate': ['This field is required.']}
+
 """}