1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <time.h>
   4 
   5 int main (int argc, char *argv[])
   6 {
   7     if (argc != 2) {
   8         fprintf(stderr, "Usage: %s UNIXTIME\n", argv[0]);
   9         return 1;
  10     }
  11     char buffer[256];
  12     long int seconds = strtol(argv[1], 0, 10);
  13     strftime(buffer, sizeof buffer, "%F, %T", gmtime(&seconds));
  14     fprintf(stdout, "%s\n", buffer);
  15     return 0;
  16 }