Include files
Include jQuery, the plugin and its css file on a page.
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script type="text/javascript" src="js/jQuery.countdownTimer.js"></script>
<!-- Good alternative is to include minified file jQuery.countdownTimer.min.js -->
<link rel="stylesheet" type="text/css" href="css/jQuery.countdownTimer.css" />
<!-- For regional language support, include below file -->
<!--<script type="text/javascript" src="js/localisation/jQuery.countdownTimer-[region-code].js"></script>-->
