JQuery, datepicker and yy-mm-dd

Hi all,

I'm trying to use the Datepicker widget but I'm failing to set the following format "yy-mm-dd" aka ISO Format.
This is the code I use, but this is not the right date format:

<link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
  <script src="//code.jquery.com/jquery-1.10.2.js"></script>
  <script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script>
  $(function() {
    $( "#teaching-when" ).datepicker();
  });
  </script>

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Any ideas?

Best regards,
Richard