title: Date.js 'tt' format doesn't work?
body: <p>I am using the following javascript code:</p>
  
  <pre><code>var d = Date.parseExact('Jun 4, 2012 12:30:00 AM','MMM d, yyyy h:mm:ss tt');
  alert(d.toString('MMM d, yyyy h:mm:ss tt'));
  </code></pre>
  
  <p>the result of the alert is:</p>
  
  <pre><code>Jun 4, 2012 12:30:00 PM
  </code></pre>
  
  <p>seems like Date.js doesn't really care about my 'tt' format....
  is it a bug??</p>
  
  <p>Thanks.</p>