title: How to read timestamp from uint64
body: <p>I want to read and display a timestamp in mseconds since epoch , which was send from a client application. My code looks like this:</p>
  
  <pre><code>QDateTime timestamp;
  
  timestamp.fromMSecsSinceEpoch(dataBody.timeStamp);
  out &lt;&lt; "Time Stamp:" + timestamp.toString(Qt::SystemLocaleShortDate) + "\n";
  </code></pre>
  
  <p>However, the output is "Time Stamp:", and system says that timestamp is invalid.
  What is wrong with my code?</p>