qint64转时间

void MediaPlay::updateTimeInfo(const qint64 &Position){    QString tStr;    if (Position || m_duration) {        QTime currentTime((Position/3600)%60, (Position/60)%60, Position%60, (Position*1000)%1000);        QTime totalTime((m_duration/3600)%60, (m_duration/60)%60, m_duration%60, (m_duration*1000)%1000);        QString format = "mm:ss";        if (m_duration > 3600)            format = "hh:mm:ss";        tStr = currentTime.toString(format) + " / " + totalTime.toString(format);    }    m_displayTime->setText(tStr);}