JSFiddle - React, Tailwind, and code Playground

HTML

<input id="datepicker" value="10/03/2013" />
<div />

JavaScript

var holidayArray2013 = [new Date('October 3, 2013 00:00:00 GMT+0200').getTime(), new Date('December 25, 2013 00:00:00 GMT+0100').getTime(), new Date('December 26, 2013 00:00:00 GMT+0100').getTime()];
var DateOfOrder = new Date($('#datepicker').datepicker({ dateFormat: 'yy-mm-dd' }).val()).getTime();
$('div').append("date: "+DateOfOrder);
if ($.inArray(DateOfOrder, holidayArray2013) > -1) {
  $('div').append('ok');
}
else $('div').append('nok');