a method to report a RFC-2822 Compliant Date from a labDT object

            https://tools.ietf.org/html/rfc2822.html#page-14

        :return: string with RFC-2822 compliant date time

def rfc2822(self):

        ''' 
            a method to report a RFC-2822 Compliant Date from a labDT object

            https://tools.ietf.org/html/rfc2822.html#page-14

        :return: string with RFC-2822 compliant date time
        '''

    # define format
        js_format = '%a, %d %b %Y %H:%M:%S GMT'
        utc_time = self.astimezone(pytz.utc)

        return format(utc_time, js_format)