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

int main() {
    char *out = malloc(200);
    struct tm *tmp;

    time_t t = time(NULL);
    tmp = localtime(&t);

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

    if (strftime(out, 200, "%s", tmp) == 0) {
        fprintf(stderr, "strftime returned 0");
        exit(EXIT_FAILURE);
    }

    printf("Result string is %s", out);
    exit(EXIT_SUCCESS);
}