JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.9.1.js"></script>
<script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<script>
$(function() {
$( ".datepicker" ).datepicker();
});
</script>
<div id='cont'>
    <p>Date: <input type="text" class="datepicker"></p>
    <p>Date: <input type="text" class="datepicker"></p>
</div>
        <a href='#' class='btn'>clone</a>

JavaScript

$('.btn').click(function(){
    var $cont = $('#cont');
    var $clone = $cont.find('p:last').clone().appendTo('#cont');
    $clone.find('.datepicker').attr("id",'').removeClass('hasDatepicker').datepicker();
})