I have this code:

Qt Code: 
  1. QTimer *timer=new QTimer;
  2.     connect(timer, SIGNAL(timeout()),this,SLOT(delete_old_tuples()));
  3.     timer->start(3600000);
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Qt Code: 
  1. void MainWindow::delete_old_tuples(){
  2.     QDateTime now = QDateTime::currentDateTime();
  3.     QDateTime timeoftheaction (QDate (now.date()), QTime (15,0,0));
  4.     if (now >= timeoftheaction){
  5.         QMessageBox::critical(0, qApp->tr("Deleting tuples"),
  6.                                  qApp->tr("Click Cancel to exit."), QMessageBox::Cancel);
  7.     }
  8. }
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Is this code correct? I want to delete the tuples of my database everyday at 15:00....Is there a better way?