JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//code.jquery.com/ui/1.11.3/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.11.3/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<input type="text" id="datepicker"

JavaScript

$( "#datepicker" ).datepicker({
  defaultDate: +2
});
// Getter
var defaultDate = $( ".selector" ).datepicker( "option", "defaultDate" );
 
// Setter
$( ".selector" ).datepicker( "option", "defaultDate", +2 );