JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://bitbucket.org/mckamey/countdown.js/raw/tip/countdown.min.js"></script>

JavaScript

var date_now = 1218374;
var date_future = 29384744;

diff = countdown(date_now * 1000, date_future * 1000, countdown.DAYS | countdown.HOURS | countdown.MINUTES | countdown.SECONDS);
alert("days: " + diff.days + " hours: " + diff.hours + " minutes: " + diff.minutes + " seconds: " + diff.seconds);

//or even better:
alert(diff.toString());