void gettime()
    {
        time_t rawtime;
        struct tm *ptminfo;
        time(&rawtime);
        ptminfo = localtime(&rawtime);
        printf("current: %02d-%02d-%02d %02d:%02d:%02d\n",
        ptminfo->tm_year + 1900, ptminfo->tm_mon + 1, ptminfo->tm_mday,
        ptminfo->tm_hour, ptminfo->tm_min, ptminfo->tm_sec);
    }