C显示系统时间

#include<stdio.h>#include<time.h>void main(){ time_t tim;    struct tm *at;    char now[40];    time(&tim);    at=localtime(&tim);    strftime(now,40,"%Y%m%d\n",at);    puts(now);    at->tm_mon+=3;     strftime(now,40,"%Y%m%d\n",at);    puts(now); }

显示当前系统时间和三个月的系统时间