Edit in JSFiddle

var $input = $('input')
$input.datepicker({
    dateFormat: 'dd-mm-yy'
  , onClose: function(dateText) {
        for (var i = 0, date = dateText.split('-'), item; item = $input[i];) {
            item.value = date[i++];
        }
    }
})

<input name="dd">
<input name="mm">
<input name="yy">