Ticket #10602: auto_now.diff

django/db/models/fields/__init__.py

@@ -478 +478 @@
 
     def pre_save(self, model_instance, add):
         if self.auto_now or (self.auto_now_add and add):
-            value = datetime.datetime.now()
+            value = datetime.date.today()
             setattr(model_instance, self.attname, value)
             return value
         else:
@@ -557 +557 @@
                     raise exceptions.ValidationError(
                         _('Enter a valid date/time in YYYY-MM-DD HH:MM[:ss[.uuuuuu]] format.'))
 
+    def pre_save(self, model_instance, add):
+        if self.auto_now or (self.auto_now_add and add):
+            value = datetime.datetime.now()
+            setattr(model_instance, self.attname, value)
+            return value
+        else:
+            return super(DateTimeFieldField, self).pre_save(model_instance, add)
+
     def get_db_prep_value(self, value):
         # Casts dates into the format expected by the backend
         return connection.ops.value_to_db_datetime(self.to_python(value))