title: ui grid date cellfilter, filtering date format is causing wrong date to show up
body: <p><a href="http://plnkr.co/edit/2dJAoMULBKD6frSSW7FN?p=preview" rel="nofollow">http://plnkr.co/edit/2dJAoMULBKD6frSSW7FN?p=preview</a></p>
  
  <p>Please have a look at the plunkr above</p>
  
  <p>I have give data as </p>
  
  <pre><code>date = "2008-12-10T04:00:00.000Z"
  </code></pre>
  
  <p>and applied cellfilter </p>
  
  <pre><code>cellFilter: 'date:"yyyy-MM-dd HH:mm"',
  </code></pre>
  
  <p>however the ending result it is showing as 2008-12-09 23:00, it should show 2008-12-10 04:00?</p>