QT计算时间戳差值

方法一：（还未尝试）
QTime startTime = QTime::currentTime();
    QThread::msleep(SLEEP_TIME_MILL);
    QTime stopTime = QTime::currentTime();
    int elapsed = startTime.msecsTo(stopTime);
    qDebug()<<"QTime.currentTime ="<<elapsed<<"ms";

方法二：

 QDateTime current _time = QDateTime::currentDateTime();

//计算时间差，先将两时间值 转成uint型，再进行减操作

 　uint start_time = time.toTime_t();   //time在之间就获取了

     uint end_time = current_tome.toTime_t();

   int t_Ret = end_time - start_time;//计算结果为s