title: javascript convert from epoch string to Date object
body: <pre><code>var myDate = new Date();
  var epoch = myDate.getTime(); //1318023197289 number of ms since epoch
  var unixEpoch = Math.round(epoch/1000)
  </code></pre>
  
  <ol>
  <li>How do you convert <code>epoch</code> back to a Date object?</li>
  <li>Can you also convert unixEpoch back to a Date object?</li>
  </ol>