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

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

    time_of_day = time( NULL );
    gmtime_s( &time_of_day, &tmbuf );
    asctime_s( buf, sizeof( buf ), &tmbuf );
    printf( "It is now: %.24s GMT\n", buf );
}