Ticket #2192: datefield_unique.diff

django/db/models/fields/__init__.py

@@ -412 +412 @@
         if lookup_type == 'range':
             value = [str(v) for v in value]
         elif lookup_type in ('exact', 'gt', 'gte', 'lt', 'lte', 'ne'):
+            if type(value) is str:
+                value = self.to_python(value)
             value = value.strftime('%Y-%m-%d')
         else:
             value = str(value)