Example

       #include <stdlib.h>
       #include <stdio.h>
       #include <time.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 strftime(). */

       main()
       {
           int count,
               i;
           char 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 = strftime(buffer, BUF_SIZE,
                      "Date: %A %d %B %Y%nTime: %T%n%n", tm_ptr);
               if (count == 0) {
                   perror("strftime");
                   exit(EXIT_FAILURE);
               }

               /* Print the result */
              printf(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 = strftime(buffer, BUF_SIZE,
                      "Date: %A %d %B %Y%nTime: %T%n%n", tm_ptr);
               if (count == 0) {
                   perror("strftime");
                   exit(EXIT_FAILURE);
               }

               /* Print the result */
               printf(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