Input

 tzlen

    Length of the tzname buffer.

 utc

    Binary time.

    Output

 tzname

    Character string that is long enough to hold the time zone label.

 tdf

    Longword with differential in seconds east or west of GMT.

 isdst

    Integer with a value of -1, indicating that no information is
    supplied as to whether it is standard time or daylight saving
    time. A value of -1 is always returned.