title: QTime to QTimer
body: <p>How can I transform QTime to QTimer so I could print the left time to <code>qDebug</code>?
  Here's some code:</p>
  
  <pre><code>QTime time = QTime::fromString("23:54", "hh:mm");
  </code></pre>
  
  <p>How can I  take one second away from time every second and print the left time to <code>qDebug</code>?</p>