获取当前时间

static void get_local_time(char *pc_str)
{
    time_t now;
    struct tm *timenow;

    assert(pc_str != NULL);
/*
time_t t;
  srand((unsigned)time(&t));    //初始化随机种子, 否则随机数不随机
*/
    time(&now);
    timenow = localtime(&now);
    sprintf(pc_str, "%04d-%02d-%02dT%02d:%02d:%02d", timenow->tm_year+1900, timenow->tm_mon+1, timenow->tm_mday,
                    timenow->tm_hour, timenow->tm_min, timenow->tm_sec);
}