/* Exercise the wcsftime formatting routine.             */
  /* NOTE: the format string is an "L" (or wide character) */
  /*       string indicating that this call is NOT in      */
  /*       the XPG4 format, but rather in ISO C format.    */

 #include <stdlib.h>
 #include <stdio.h>
 #include <time.h>
 #include <wchar.h>
 #include <locale.h>
 #include <errno.h>

 #define NUM_OF_DATES  7
 #define BUF_SIZE 256

  /* This program formats a number of different dates, once using the   */
  /* C locale and then using the fr_FR.ISO8859-1 locale.  Date and time */
  /* formatting is done using wcsftime().                               */

 main()

 {
   int count,
       i;
   wchar_t buffer[BUF_SIZE];
   struct tm *tm_ptr;
   time_t time_list[NUM_OF_DATES] =
   {500, 68200000, 694223999,
    694224000, 704900000, 705000000,
    705900000};

   /* Display dates using the C locale */
   printf("\nUsing the C locale:\n\n");

   setlocale(LC_ALL, "C");

   for (i = 0; i < NUM_OF_DATES; i++) {
       /* Convert to a tm structure */
       tm_ptr = localtime(&time_list[i]);

       /* Format the date and time */
       count = wcsftime(buffer, BUF_
 SIZE, L"Date: %A %d %B %Y%nTime: %T%n%n",
                       tm_ptr);
       if (count == 0) {
           perror("wcsftime");
           exit(EXIT_FAILURE);
       }

       /* Print the result */
       printf("%S", buffer);
   }

   /* Display dates using the fr_FR.ISO8859-1 locale */
   printf("\nUsing the fr_FR.ISO8859-1 locale:\n\n");

   setlocale(LC_ALL, "fr_FR.ISO8859-1");

   for (i = 0; i < NUM_OF_DATES; i++) {
       /* Convert to a tm structure */
       tm_ptr = localtime(&time_list[i]);

       /* Format the date and time */
       count = wcsftime(buffer, BUF_
 SIZE, L"Date: %A %d %B %Y%nTime: %T%n%n",
                        tm_ptr);
       if (count == 0) {
           perror("wcsftime");
           exit(EXIT_FAILURE);
       }

       /* Print the result */
       printf("%S", buffer);
   }
 }

    Running the example program produces the following result:

    Using the C locale:

    Date: Thursday 01 January 1970
    Time: 00:08:20

    Date: Tuesday 29 February 1972
    Time: 08:26:40

    Date: Tuesday 31 December 1991
    Time: 23:59:59

    Date: Wednesday 01 January 1992
    Time: 00:00:00

    Date: Sunday 03 May 1992
    Time: 13:33:20

    Date: Monday 04 May 1992
    Time: 17:20:00

    Date: Friday 15 May 1992
    Time: 03:20:00

    Using the fr_FR.ISO8859-1 locale:

    Date: jeudi 01 janvier 1970
    Time: 00:08:20

    Date: mardi 29 février 1972
    Time: 08:26:40

    Date: mardi 31 décembre 1991
    Time: 23:59:59

    Date: mercredi 01 janvier 1992
    Time: 00:00:00

    Date: dimanche 03 mai 1992
    Time: 13:33:20

    Date: lundi 04 mai 1992
    Time: 17:20:00

    Date: vendredi 15 mai 1992
    Time: 03:20:00