jQuery UI DatePicker - Change Date Format

Question

I am using the UI DatePicker from jQuery UI as the stand alone picker. I have this code:

<div id="datepicker"></div>

And the following JS:

$('#datepicker').datepicker();

When I try to return the value with this code:

var date = $('#datepicker').datepicker('getDate');

I am returned this:

Tue Aug 25 2009 00:00:00 GMT+0100 (BST)

Which is totally the wrong format. Is there a way I can get it returned in the format DD-MM-YYYY?