VMS Help CC, Run-time functions, gmtime, gmtime_r  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Converts the time (in seconds since the Epoch) pointed to by timer
  into a broken-down time, expressed as Coordinated Universal Time
  (UTC).

  Note:  The name of this function was originally defined to return
  the time expressed as GMT (Greenwich Mean Time); its definition was
  changed to reflect current technical standard terminology.

  gmtime_r puts the result into a user-specified buffer.

  gmtime puts the result into thread-specific static memory allocated
  by the Compaq C RTL, which can be overwritten by subsequent calls
  to gmtime; you must make a copy if you want to save it.

  Syntax:

       #include <time.h>

       struct tm *gmtime (const time_t *timer);

       struct tm *gmtime_r(const time_t *timer, struct tm *result);
       [posix1]