title: Add multiple TimeSpans together with datejs
body: <p>I'm using the JavaScript library datejs and in particularly the TimeSpan class.</p>
  
  <p>I've got it all working great for one TimeSpan.  However I need it to add together the results of multiple TimeSpans on the page. My code is below:</p>
  
  <pre><code>var monTimeSpan = new TimeSpan(Date.parse($("#monFinish").val()) - Date.parse($("#monStart").val()))
  
  var tueTimeSpan = new TimeSpan(Date.parse($("#tueFinish").val()) - Date.parse($("#tueStart").val()))
  </code></pre>
  
  <p>These work great but I need to add the result of the Tuesday TimeSpan to the Monday one.</p>
  
  <p>Any help would be great.</p>
  
  <p>Thanks  </p>