SilcBool silc_time_universal(const char *universal_time,
                                 SilcTime ret_time);

    Returns time and date as SilcTime from `universal_time' string which
    format is "YYMMDDhhmmssZ", where YY is year, MM is month, DD is day,
    hh is hour, mm is minutes, ss is seconds and Z is timezone, which
    by default is Zulu (UTC).  Universal time is defined in ISO/EIC 8824-1.

    Returns FALSE on error, TRUE otherwise.

    SilcTimeStruct ret_time;

    time is 03/02/19 19:04:03 Zulu (UTC)
    silc_time_universal("030219190403Z", &ret_time);