//en.cppreference.com/w/c/chrono/ctime.html
#define __STDC_WANT_LIB_EXT1__ 1
#include <time.h>
#include <stdio.h>
int main(void)
{
time_t result = time(NULL);
printf("%s", ctime(&result));
#ifdef __STDC_LIB_EXT1__
char str[26];
ctime_s(str,sizeof str,&result);
printf("%s", str);
#endif
}