title: AngularJS ngRepeat orderBy not working with DateTime string
body: <p>Please see this JSFiddle <a href="http://jsfiddle.net/luke88jones/MfLqa/2/" rel="nofollow">http://jsfiddle.net/luke88jones/MfLqa/2/</a></p>
  
  <pre><code>&lt;div ng-repeat="booking in testBookings | orderBy: 'booking.sortDate'"&gt;
        &lt;span&gt;{{booking.bookingDateTime | date:'dd-MMM-yy HH:mm'}}&lt;/span&gt;      
  &lt;/div&gt;
  </code></pre>
  
  <p>I am trying to use the orderBy to sort a ng-repeat. Our data currently uses the bookingDateTime for the filter which isn't working. I wasn't sure if angular wasn't resolving the function so have put in the sortDate property as an ISO string and tried to sort using this but still it doesn't seem to be working. </p>
  
  <p>Any ideas? </p>