Library /sys$common/syshlp/helplib.hlb  —  CRTL  gettimeofday  Description
    The gettimeofday function gets the current time (expressed as
    seconds and microseconds) since 00::00 Coordinated Universal
    Time, January 1, 1970. The current time is stored in the timeval
    structure pointed to by the tp argument.

    The tzp argument is intended to hold time-zone information set
    by the kernel. However, because the OpenVMS kernel does not
    set time-zone information, the tzp argument should be NULL. If
    it is not NULL, it is ignored. This function is supported for
    compatibility with BSD programs.

    If the value of the SYS$TIMEZONE_DIFFERENTIAL logical is wrong,
    the function fails with errno set to EINVAL.
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