JSFiddle - React, Tailwind, and code Playground

HTML

<div id="countdown"></div>
<iframe id="site" src="http://onet.com" width="90%" height="400" name="Site">
    <p>Your Browser doesn't support iframe: Please click <a href="http://onet.com">here</a></p>
</iframe>

JavaScript

function countingEnd() {
     var test = document.getElementById("countdown").innerHTML;

    if (test = "Expired") {
        document.getElementById("site").src = "http://wp.pl";
    }   
}

var end = new Date('12/03/2014 10:14 AM');

var _second = 1000;
var _minute = _second * 60;
var _hour = _minute * 60;
var _day = _hour * 24;
var timer;

function showRemaining() {
    var now = new Date();
    var distance = end - now;
        
     if (distance < 0) {
        clearInterval(timer);
        document.getElementById('countdown').innerHTML = 'Expired';

        countingEnd();
            
        return;
     }

    var days = Math.floor(distance / _day);
    var hours = Math.floor((distance % _day) / _hour);
    var minutes = Math.floor((distance % _hour) / _minute);
    var seconds = Math.floor((distance % _minute) / _second);

    document.getElementById('countdown').innerHTML = days + 'days ';
    document.getElementById('countdown').innerHTML += hours + 'hrs ';
    document.getElementById('countdown').innerHTML += minutes + 'mins ';
    document.getElementById('countdown').innerHTML += seconds + 'secs';
}

    timer = setInterval(showRemaining, 1000);