#define __STDC_WANT_LIB_EXT1__ 1
#include <stdio.h>
#include <time.h>

void main()
{
    time_t time_of_day;
    auto char buf[26];

    time_of_day = time( NULL );
    ctime_s( buf, sizeof( buf ), &time_of_day );
    printf( "It is now: %s", buf );
}