Jquery UI Datepicker. Show one format, save other
===

I use Jquey UI to user be able to pick a date.

    var dates = $( "#checkinTxt").datepicker({
    		numberOfMonths: 2,
    		changeMonth: true,
    		dateFormat: "yy-mm-dd",
    		regional: "es",
    			
    });
I want they see the full dateFormat: "dd-MM-yy" (25-March-2013) after choose the date but keep the other dateFormat: "yy-mm-dd", in the input field (or a hidden field)

Thanks.