title: JQuery Datepicker doesn't change input value
body: <p>I'm using a Jquery UI Datepicker addon as DateTimePicker <a href="http://jsfiddle.net/j5rkbnrt/1/" rel="noreferrer">http://jsfiddle.net/j5rkbnrt/1/</a></p>
  
  <pre><code>&lt;input id="deliveryTime" name="deliveryTime" type="text" value="08/05/2015 10:00"&gt;
  
   $('#deliveryTime').datetimepicker({
       dateFormat: 'dd/mm/yy',
       timeFormat: 'HH:mm',
   });
  </code></pre>
  
  <p>The DateTimePicker is associated to the input field.
  When I select the date the value of the input field is not changed.
  So when I submit the form containing this input I always get the default value.</p>
  
  <p>I had a look at the default jquery datepicker and that also doesn't change the value of the input. <a href="https://jqueryui.com/datepicker/" rel="noreferrer">https://jqueryui.com/datepicker/</a> </p>
  
  <p>What am I missing here?</p>