C语言：获取当前时间，并转为字符串
这个功能挺常用的，记录一下：
#include <time.h>#include <stdio.h>int main(){time_t nowtime = time(NULL);tm *now = localtime(&nowtime);printf("now: %04d-%02d-%02d %02d:%02d:%02d\nunix time: %ld\n", now->tm_year+1900, now->tm_mon+1, now->tm_mday, now->tm_hour, now->tm_min, now->tm_sec, (long)nowtime);return 0;}