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.