title: QTime how to add/substract time QT/C++
body: <p>I'm trying to add/substract time in a QTime object.</p>
  
  <pre><code>QString time = "10:00:00";
  QTime tobj = QTime::fromString(currentTime,"hh:mm:ss");
  tobj.addSecs(3600);
  qDebugs() &lt;&lt; "time:" &lt;&lt; tobj;
  </code></pre>
  
  <p>I would expect the debugger to output "11:00:00", but it just stays "10:00:00", why is this and what am i over looking?</p>