CounterDown - Javascript

counter-down.js

function format2(value) {
  if (value < 10) return '0' + value;
  
  return value;
}

// Set the date we're counting down to
var countDownDate = 3*60000;
var now = 0;
var element = document.getElementById("demo");
// Update the count down every 1 second
var x = setInterval(function() {

    // Get todays date and time
    
    // Find the distance between now an the count down date
    var distance = countDownDate - now;
    now += 1000;
    
    var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
    var seconds = Math.floor((distance % (1000 * 60)) / 1000);
    
    // Output the result in an element with id="demo"
    element.innerHTML = format2(minutes) + ":" + format2(seconds);
    
    // If the count down is over, write some text 
    if (distance < 0) {
        clearInterval(x);
        element.innerHTML = "EXPIRED";
    }
}, 1000);