JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/smoothness/jquery-ui.css">
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
<input type="text" id="testdate" name="testdate" value="2017-01-01" />

JavaScript

$('#testdate').datepicker();
$('#testdate').datepicker('option', 'dateFormat', 'yy-mm-dd');
$("#testdate").datepicker('setDate', new Date('2017-01-01 12:00:00'));