clean code related to Py2 + six.text_type & six.string_types

tests/fields/test_date_field.py

@@ -89,17 +89,6 @@ class TestDateField(MongoDBTestCase):
         assert log.date == d1.date()
         assert log.date == d2.date()
 
-        if not six.PY3:
-            # Pre UTC dates microseconds below 1000 are dropped
-            # This does not seem to be true in PY3
-            d1 = datetime.datetime(1969, 12, 31, 23, 59, 59, 999)
-            d2 = datetime.datetime(1969, 12, 31, 23, 59, 59)
-            log.date = d1
-            log.save()
-            log.reload()
-            assert log.date == d1.date()
-            assert log.date == d2.date()
-
     def test_regular_usage(self):
         """Tests for regular datetime fields"""