document.addEventListener('DOMContentLoaded', function() {

  var startDate=[2018,11,22,0,0],endDate=[2018,11,26,0,0];

  function getServerTime() {

    var e = new Date;
    return e.setTime(e.getTime() + offset), e
  }

  function getTimeRemaining(e) {

    tc = Date.parse(e) - getServerTime(), terminou = !(Date.parse(e) > getServerTime());

    var t = Math.floor(tc / 1e3 % 60),
        a = Math.floor(tc / 1e3 / 60 % 60),
        r = Math.floor(tc / 36e5 % 24),
        n = Math.floor(tc / 864e5);

    return {

        total: tc,
        days: n,
        hours: r,
        minutes: a,
        seconds: t
    }
}

function calcOffset() {

    request.open("HEAD", "/", !0), request.onload = function() {

        function e() {

            deadline = Date.parse(deadline_1) - getServerTime() > 0 ? deadline_1 : deadline_2;

            for (var e = getTimeRemaining(deadline), t = 0; t < c.length; t++) !c[t].classList.contains("exclude") ? c[t].classList.toggle("hide", terminou) : '';

            n.innerHTML = e.days, i.innerHTML = terminou ? "00" : ("0" + e.hours).slice(-2), s.innerHTML = terminou ? "00" : ("0" + e.minutes).slice(-2),
            o.innerHTML = terminou ? "00" : ("0" + e.seconds).slice(-2), l.innerHTML = terminou ? terminouTxt : Date.parse(deadline_1) - getServerTime() > 0 ? iniciaTxt : terminaTxt,
            e.total <= 0 && clearInterval(d)
        }

        var t = request.getResponseHeader("Date"),
            a = new Date;

        serverTimeMillisGMT = Date.parse(new Date(Date.parse(t)).toUTCString()), localMillisUTC = Date.parse((new Date).toUTCString()), offset = serverTimeMillisGMT - localMillisUTC;

        var r = document.getElementById("clockdiv"),
            n = r.querySelector(".days"),
            i = r.querySelector(".hours"),
            s = r.querySelector(".minutes"),
            o = r.querySelector(".seconds"),
            l = r.querySelector(".clockTitle"),
            c = r.getElementsByClassName("clockNumber");
        e();

        var d = setInterval(e, 1e3)
    }, request.send()
}

startDate[1] = startDate[1] - 1, endDate[1] = endDate[1] - 1;

var deadline_1 =
  new Date(Date.UTC(startDate[0], startDate[1], startDate[2], startDate[3], startDate[4], 0)),
    deadline_2 = new Date(Date.UTC(endDate[0], endDate[1], endDate[2], endDate[3], endDate[4], 0)),
    terminou = !1,
    request, tc, offset = 0,
    serverTimeMillisGMT = 0,
    localMillisUTC = 0,
    deadline = new Date;

  request = window.XMLHttpRequest ? new XMLHttpRequest : new ActiveXObject("Microsoft.XMLHTTP");

  var iniciaTxt="Inicia em:",terminaTxt="Termina em:",terminouTxt="Terminou em "+deadline_2.toLocaleString("pt-PT",{hour12:!1});

  calcOffset();
}, false);