docs: def get_db_prep_lookup(self, lookup_type, value, connection=None, prepared=None):
          """
          Returns field's value prepared for database lookup.
          """
          ## convert to settings.TIME_ZONE
          if value.tzinfo is None:
              value = default_tz.localize(value)
          else:
              value = value.astimezone(default_tz)
          return super(LocalizedDateTimeField, self).get_db_prep_lookup(lookup_type, value, connection=connection, prepared=prepared)