EXAMPLE
       The program below can be used to experiment with strftime().

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

       int
       main(int argc, char *argv[])
       {
           char outstr[200];
           time_t t;
           struct tm *tmp;

           t = time(NULL);
           tmp = localtime(&t);
           if (tmp == NULL) {
               perror("localtime");
               exit(EXIT_FAILURE);
           }

           if (strftime(outstr, sizeof(outstr), argv[1], tmp) == 0) {
               fprintf(stderr, "strftime returned 0");
               exit(EXIT_FAILURE);
           }

           printf("Result string is \"%s\"\n", outstr);
           exit(EXIT_SUCCESS);
       } /* main */

       Some examples of the result string produced by the glibc implementation
       of strftime() are as follows:

       $ ./a.out "%m"
       Result string is "11"
       $ ./a.out "%5m"
       Result string is "00011"
       $ ./a.out "%_5m"
       Result string is "   11"