如何在jQuery UI datepicker中获取日期，月份和年份？

I have this sample code:

我有这个示例代码：

<div id="calendar"></div>
$(document).ready(function()  {
    $('#calendar').datepicker({
      dateFormat: 'yy-m-d',
      inline: true,
      onSelect: function(dateText, inst) { 
            var month = dateText.getUTCMonth();
            var day = dateText.getUTCDate();
            var year = dateText.getUTCFullYear();
            alert(day+month+year);
     } 
    });
});
<div id=