def fromSignHoursMinutes(cls, sign, hours, minutes):
        """
        Construct a L{FixedOffsetTimeZone} from an offset described by sign
        ('+' or '-'), hours, and minutes.

        @note: For protocol compatibility with AMP, this method never uses 'Z'

        @param sign: A string describing the positive or negative-ness of the
            offset.

        @param hours: The number of hours in the offset.
        @type hours: L{int}

        @param minutes: The number of minutes in the offset
        @type minutes: L{int}

        @return: A time zone with the given offset, and a name describing the
            offset.
        @rtype: L{FixedOffsetTimeZone}
        """
        name = "%s%02i:%02i" % (sign, hours, minutes)
        if sign == "-":
            hours = -hours
            minutes = -minutes
        elif sign != "+":
            raise ValueError("Invalid sign for timezone %r" % (sign,))
        return cls(timedelta(hours=hours, minutes=minutes), name)

        Construct a L{FixedOffsetTimeZone} from an offset described by sign
        ('+' or '-'), hours, and minutes.

        @note: For protocol compatibility with AMP, this method never uses 'Z'

        @param sign: A string describing the positive or negative-ness of the
            offset.

        @param hours: The number of hours in the offset.
        @type hours: L{int}

        @param minutes: The number of minutes in the offset
        @type minutes: L{int}

        @return: A time zone with the given offset, and a name describing the
            offset.
        @rtype: L{FixedOffsetTimeZone}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/_tzhelper.py