C语言输出当前日期和时间

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#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