User:BakiDance/citizen.js

// Set the date we're counting down to
var spanDate = document.getElementById("get-time").innerText;
var countDownDate = new Date(spanDate).getTime();

// Update the count down every 1 second
var x = setInterval(function() {

  // Get today's date and time
  var now = new Date().getTime();

  // Find the distance between now and the count down date
  var distance = countDownDate - now;

  // Time calculations for days, hours, minutes and seconds
  var days = Math.floor(distance / (1000 * 60 * 60 * 24));
  var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
  var seconds = Math.floor((distance % (1000 * 60)) / 1000);

  // Display the result in the element with id="demo"
  if ($.inArray("Pages with a countdown", mw.config.get("wgCategories")) > -1) {
    document.getElementById("live-countdown").innerHTML = days + "d " + hours + "h "
    + minutes + "m " + seconds + "s ";
  }
  // If the count down is finished, write some text
  if (distance < 0 && $.inArray("Pages with a countdown", mw.config.get("wgCategories")) > -1) {
    clearInterval(x);
    document.getElementById("live-countdown").innerHTML = "This event has ended!";
  }
}, 1000);