jQuery UI DatePicker - Change Date Format

inside the jQuery script code just paste the code.

$( ".selector" ).datepicker({ dateFormat: 'yy-mm-dd' });

this should work.

Here's one specific for your code:

var date = $('#datepicker').datepicker({ dateFormat: 'dd-mm-yy' }).val();

More general info available here:

• http://api.jqueryui.com/datepicker/#option-dateFormat
• http://api.jqueryui.com/datepicker/#utility-formatDate