def get_db_prep_save(self, value):
        "Returns field's value prepared for saving into a database."
        ## convert to settings.TIME_ZONE
        if value > None:
            if value.tzinfo is None:
                value = default_tz.localize(value)
            else:
                value = value.astimezone(default_tz)
        return super(LocalizedDateTimeField, self).get_db_prep_save(value)
dataset/ETHPy150Open davemerwin/blue-channel/external_apps/timezones/fields.py/LocalizedDateTimeField.get_db_prep_save/operator `is not` -> `>`