JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cloud.github.com/downloads/digitalBush/jquery.maskedinput/jquery.maskedinput-1.3.js"></script>
<input type="text" id="dtp" />
<a href="javascript:;" id="Shower">Show</a>

JavaScript

$("#dtp")
    .mask("9999/99/99")
    .datepicker({ dateFormat: 'yyyymmdd',
        onClose: function(dateText, inst) {  
            var res = dateText.substring(4, dateText.length);
            res = res.substring(0, 4)  + "/" + res.substring(4, 2) + "/" + res.substring(6, res.length);
            $("#dtp").val(res);
        }
    });
$("#Shower").click(function() {
    alert($("#dtp").val());
});