User:ToxiBoi/LiveCountdown.js

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This user script seems to have a documentation page at User:ToxiBoi/LiveCountdown.

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var counts = document.getElementsByClassName("toxicountdown");
for (var i = 0; i < counts.length; i++) {
  var index = counts[i];
  counts[i].innerHTML = "Loading countdown...";
  var endDate = new Date(counts[i].getAttribute("data-end")).getTime();
  var now = new Date().getTime();
  var distance = endDate - now;

  if (distance < 0) {
    counts[i].innerHTML = "The countdown finished.";
  } else {
    var update = setInterval(function () {
      // Setup again
      endDate = new Date(index.getAttribute("data-end")).getTime();
      now = new Date().getTime();
      distance = endDate - now;
      // Time calculations for days, hours, minutes and seconds (copied from W3Schools)
      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
      index.innerHTML =
        "There are <b>" +
        days +
        "</b> days, <b>" +
        hours +
        "</b> hours, <b>" +
        minutes +
        "</b> minutes, and <b>" +
        seconds +
        "</b> seconds until " +
        index.getAttribute("data-event") +
        ".";

      // If the count down is finished, refresh
      if (distance < 0) {
        clearInterval(update);
        index.innerHTML = "Countdown expired, refreshing...";
        document.location.reload();
      }
    }, 1000);
  }
}