title: Jquery UI datepicker with custom default date
body: <p>I am using jquery UI. I want to set last sunday select as default value.<br></p>
  
  <pre><code>&lt;script&gt;
      $(function() {
          $( "#datepicker" ).datepicker({
              dateFormat: 'dd-mm-yy',
              currentText: "???"
          });
      });
  
  &lt;/script&gt;
  </code></pre>
  
  <p>what to write in place of ??? to achieve this?</p>