C 将字符串转换成时间戳 相当于PHP中strtotime函数

unsigned long strtotime(char *date)
{
        struct tm t;
        unsigned long time;

        sscanf(date,"%d-%d-%d",&t.tm_year,&t.tm_mon,&t.tm_mday);

        t.tm_year-=1900;
        t.tm_mon-=1;
        t.tm_hour=0;
        t.tm_min=0;
        t.tm_sec=0;
        time=mktime(&t);      //转换
        return time;
}