MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
function getTimeRemaining(endtime) {
    var t = Date.parse(endtime) - Date.parse(new Date());
    var seconds = Math.floor((t / 1000) % 60);
    var minutes = Math.floor((t / 1000 / 60) % 60);
    var hours = Math.floor((t / (1000 * 60 * 60)) % 24);
    var days = Math.floor(t / (1000 * 60 * 60 * 24));
    return {
        'total': t,
        'days': days,
        'hours': hours,
        'minutes': minutes,
        'seconds': seconds
    };
}

function initializeClock(id, endtime) {
    var clock = document.getElementById(id);
    var daysSpan = clock.querySelector('.days');
    var hoursSpan = clock.querySelector('.hours');
    var minutesSpan = clock.querySelector('.minutes');
    var secondsSpan = clock.querySelector('.seconds');

    function updateClock() {
        var t = getTimeRemaining(endtime);

        daysSpan.innerHTML = t.days;
        hoursSpan.innerHTML = ('0' + t.hours).slice(-2);
        minutesSpan.innerHTML = ('0' + t.minutes).slice(-2);
        secondsSpan.innerHTML = ('0' + t.seconds).slice(-2);

        if (t.total <= 0) {
            clearInterval(timeinterval);
        }
    }

    updateClock();
    var timeinterval = setInterval(updateClock, 1000);
}

/* only run this on the page that there is a clock div...  */
// Or just a plain access for comparison
// (no need to check exists first, it falls back to null)

$(function () {
    if (mw.config.get('wgPageName') === 'Template:Countdown' || mw.config.get('wgPageName') === 'Welcome' ) {
        var deadline = new Date(2025, 09, 8, 13, 37, 42, 0); /* base 0 months */
        initializeClock('clockdiv', deadline);
    }
});