Date format

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

#define MAX_BUF 50

int main(void)
{
    char buf[MAX_BUF];
    time_t seconds = time(NULL);
    struct tm *now = localtime(&seconds);

    const char *months[] = {
            "January", "February",
            "March", "April", "May", "June",
            "July", "August", "September",
            "October", "November", "December"
    };

    const char *days[] = {
            "Sunday", "Monday",
            "Tuesday", "Wednesday",
            "Thursday", "Friday", "Saturday"
    };

    (void) printf("%d-%d-%d\n", now->tm_year + 1900, now->tm_mon + 1, now->tm_mday);
    (void) printf("%s, %s %d, %d\n", days[now->tm_wday], months[now->tm_mon],
                  now->tm_mday, now->tm_year + 1900);

    // using the strftime (the result depends on the locale)
    (void) strftime(buf, MAX_BUF, "%A, %B %e, %Y", now);
    (void) printf("%s\n", buf);
    return EXIT_SUCCESS;
}

OUTPUT

2016-7-29
Friday, July 29, 2016
Friday, July 29, 2016