C语言输出当前日期和时间

#include <stdio.h>
#include <time.h>
 
char* asctime2(const struct tm *timeptr)
{
  static const char wday_name[][4] = {
    "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  };
  static const char mon_name[][4] = {
    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  };
  static char result[26];
  sprintf(result, "%.3s %.3s%3d %.2d:%.2d:%.2d %d",
    wday_name[timeptr->tm_wday],
    mon_name[timeptr->tm_mon],
    timeptr->tm_mday, timeptr->tm_hour,
    timeptr->tm_min, timeptr->tm_sec,
    1900 + timeptr->tm_year);
  return result;
}
 
int main(void)
{
    time_t rawtime;
    struct tm *timeinfo;
 
    time(&rawtime);
    timeinfo = localtime(&rawtime);
    printf("%s", asctime2(timeinfo));
 
    return 0;
}
 
//REF:
//http://en.cppreference.com/w/c/chrono/asctime