title: jQuery datepicker setting date not working in IE8
body: <p>The developer tools show no error message. Works fine on Chrome, Firefox and Safari.</p>
  
  <pre><code>$("#datepicker").datepicker();
  console.log($("#datepicker").datepicker("isDisabled")); // prints false
  $("#datepicker").datepicker("setDate", new Date());
  console.log("here"); // doesn't print at all
  </code></pre>