Ticket #2993: lazydate-no-isinstance.diff

__init__.py

@@ -459 +459 @@
         # Casts dates into string format for entry into database.
         if isinstance(value, datetime.datetime):
             value = value.date().strftime('%Y-%m-%d')
-        elif isinstance(value, datetime.date):
+        elif value is not None:
             value = value.strftime('%Y-%m-%d')
         return Field.get_db_prep_save(self, value)
 
@@ -495 +495 @@
             if settings.DATABASE_ENGINE == 'mysql' and hasattr(value, 'microsecond'):
                 value = value.replace(microsecond=0)
             value = str(value)
-        elif isinstance(value, datetime.date):
+        elif value is not None:
             # MySQL will throw a warning if microseconds are given, because it
             # doesn't support microseconds.
             if settings.DATABASE_ENGINE == 'mysql' and hasattr(value, 'microsecond'):