Get a date string between January 1, 1970 and now
        :param pattern format
        :example '2008-11-27'

def date(self, pattern='%Y-%m-%d', end_datetime=None):
        """
        Get a date string between January 1, 1970 and now
        :param pattern format
        :example '2008-11-27'
        """
        return self.date_time(end_datetime=end_datetime).strftime(pattern)