JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.min.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/base/jquery-ui.css" />

<p>Date: <input id="datepicker" type="text"></p>

<p>Alt Date: <input id="alt-datepicker" type="text"></p>

<p>click on the "Date" input and select a date to see the "Alt Date" input update in a different format.</p>

JavaScript

$( "#datepicker" ).datepicker({
    altField  : '#alt-datepicker',
    altFormat : 'yy-mm-dd',
    format    : 'mm-dd-yy'
});