#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