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#include <time.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
char *format;
char outstr[200];
time_t t;
struct tm *tmp;
format = argv[1];
if (argc > 2) {
t = (time_t) atoll(argv[2]);
} else {
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("%s\n", outstr);
exit(EXIT_SUCCESS);
}
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