def format_time(self, *args):
        currentdt = datetime.datetime.now(pytz.utc)
        if len(args) > 0:
            currentdt += datetime.timedelta(*args)
        (dt, micro) = currentdt.strftime('%Y-%m-%dT%H:%M:%S.%f').split('.')
        tz_offset = currentdt.astimezone(tzlocal()).strftime('%z')
        tz_offset = "Z" if tz_offset == "" else tz_offset[
                                                :3] + ":" + tz_offset[3:]