Did you take the corrected code from my previous post.

Anyway here it is again
Qt Code: 
  1. class StopWatch : public QWidget
  2. {
  3.     Q_OBJECT
  4. public:
  5.     explicit StopWatch(QWidget * parent = 0)
  6.         : QWidget(parent)
  7.         , mRunning(false)
  8.         , mStartTime()
  9.         , mLabel(new QLabel("00:00:00,000"))
  10.         , mTotalTime(0)
  11.         , mStart(new QPushButton("Start"))
  12.         , mPause(new QPushButton("Pause"))
  13.         , mStop(new QPushButton("Stop"))
  14.     {
  15.         QGridLayout * gridLayout = new QGridLayout(this);
  16.  
  17.         gridLayout->addWidget(mLabel,   0, 0, 1, 3);
  18.         gridLayout->addWidget(mStart,   1, 0, 1, 1);
  19.         gridLayout->addWidget(mPause,   1, 1, 1, 1);
  20.         gridLayout->addWidget(mStop,    1, 2, 1, 1);
  21.  
  22.         connect(mStart, SIGNAL(clicked()), SLOT(start()));
  23.         connect(mPause, SIGNAL(clicked()), SLOT(pause()));
  24.         connect(mStop, SIGNAL(clicked()), SLOT(stop()));
  25.  
  26.         QFont font("Arial", 24, QFont::Bold);
  27.         QPalette palette = mLabel->palette();
  28.         palette.setColor(QPalette::WindowText, Qt::blue);
  29.         mLabel->setPalette(palette);
  30.         mLabel->setFont(font);
  31.         gridLayout->setAlignment(mLabel, Qt::AlignCenter);
  32.  
  33.         mStart->setEnabled(true);
  34.         mPause->setEnabled(false);
  35.         mStop->setEnabled(false);
  36.  
  37.         startTimer(0);
  38.     }
  39.  
  40. public slots:
  41.     void start(void)
  42.     {
  43.         mStartTime = QDateTime::currentDateTime();
  44.         mRunning = true;
  45.         mStart->setEnabled(false);
  46.         mPause->setEnabled(true);
  47.         mStop->setEnabled(true);
  48.     }
  49.  
  50.     void pause(void)
  51.     {
  52.         mStart->setEnabled(true);
  53.         mPause->setEnabled(false);
  54.         mStop->setEnabled(true);
  55.         timerEvent(new QTimerEvent(0));
  56.         mTotalTime += mSessionTime;
  57.         mRunning = false;
  58.     }
  59.  
  60.     void stop(void)
  61.     {
  62.         mStart->setEnabled(true);
  63.         mPause->setEnabled(false);
  64.         mStop->setEnabled(false);
  65.         mTotalTime = 0;
  66.         mRunning = false;
  67.     }
  68.  
  69. protected:
  70.     void timerEvent(QTimerEvent *)
  71.     {
  72.         if(mRunning)
  73.         {
  74.             mSessionTime = mStartTime.msecsTo(QDateTime::currentDateTime());
  75.             qint64 time = mTotalTime + mSessionTime;
  76.             time *= 111;
  77.             unsigned int h = time / 1000 / 60 / 60;
  78.             unsigned int m = (time / 1000 / 60) - (h * 60);
  79.             unsigned int s = (time / 1000) - ((m + (h * 60))* 60);
  80.             unsigned int ms = time - (s + ((m + (h * 60))* 60)) * 1000;
  81.             const QString diff = QString("%1:%2:%3,%4")
  82.                                     .arg(h,  2, 10, QChar('0'))
  83.                                     .arg(m,  2, 10, QChar('0'))
  84.                                     .arg(s,  2, 10, QChar('0'))
  85.                                     .arg(ms, 3, 10, QChar('0'));
  86.             mLabel->setText(diff);
  87.         }
  88.     }
  89.  
  90. private:
  91.     bool        mRunning;
  92.     QDateTime   mStartTime;
  93.     QLabel *    mLabel;
  94.     qint64      mTotalTime;
  95.     qint64      mSessionTime;
  96.  
  97.     QPushButton * mStart;
  98.     QPushButton * mPause;
  99.     QPushButton * mStop;
  100. };
To copy to clipboard, switch view to plain text mode