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gmtime()                 Convert Time from Long Integer to Structure

 #include   <time.h>

 struct     tm *gmtime(time);
 long       *time;                       Pointer to stored time

    gmtime() converts a time, stored as a long value, to a structure. The
    long value 'time' represents the number of seconds that have elapsed
    since 00:00:00, Jan 1 1970.  (This value can be obtained from a call
    to time()). The structure result reflects Greenwich mean time, not
    local time.

    The structure is of type 'tm', as defined in <time.h>.  The fields of
    structure 'tm' store the following values:

          'tm_sec'        Seconds
          'tm_min'        Minutes
          'tm_hour'       Hours (0-24)
          'tm_mday'       Day of month (1-31)
          'tm_mon'        Month (0-11; Jan = 0)
          'tm_year'       Year (current year minus 1900)
          'tm_wday'       Day of the week (0-6; Sun = 0)
          'tm_yday'       Day of the year (0-365; Jan 1 = 0)
          'tm_isdst'      Non-zero if daylight saving time, otherwise zero

    Returns:    A pointer to the structure result.  There is no error
                return.

      Notes:    gmtime() and localtime() use a single statically
                allocated structure to hold the result.  Each call to one
                of these routines destroys the result of the previous
                call.

                DOS does not comprehend dates prior to its birth in 1980.
                If 'time' represents a date prior to January 1, 1980,
                gmtime() returns 00:00:00, January 1, 1980.

  -------------------------------- Example ---------------------------------

    The following statements get the time stored as a long integer, store
    it in a structure, convert the structure to a character string, and
    print it out.

         #include <time.h>
         #include <stdio.h>

         long elapstime;
         struct tm *greentime;

         main()
         {
             time(&elapstime);
             greentime = gmtime(&elapstime);
             printf("Greenwich time is %s\n",asctime(greentime));
         }