default_time_format if format is blank

    def datetime(self, *args):

        time_datetime = datetime.datetime.now()

        time_format = args[0] if len(args) > 0 else self.default_time_format

        time_format = args[0] if len(args) > 0 and args[0] != "" else self.default_time_format

        try:

            time_zone = pytz.timezone(args[1]) if len(args) > 1 else None

        except pytz.exceptions.UnknownTimeZoneError as _: