Question

カウントダウンタイマーを作ろうとしたのですが残り時間が減っていきません。

var countdown = function(due){
    var now = new Date();
    var rest = due.getTime() - now.getTime();
    var sec = Math.floor(rest/1000)%60;
    var min = Math.floor(rest/1000/60)%60;
    var hour = Math.floor(rest/1000/60/60)%24;
    var days = Math.floor(rest/1000/60/60/24);
    var count = [days,hour,min,sec];
    return count;
}

var goal = new Date(2020,8,10);

var recalc = function() {
    var counter = countdown(goal);
window.onload = function(){
    document.getElementById('day').textContent = counter[0];
    document.getElementById('hour').textContent = counter[1];
    document.getElementById('min').textContent = counter[2];
    document.getElementById('sec').textContent = counter[3];
    }
    refresh();
}

var refresh = function() {
    setTimeout(recalc,1000);
 }
recalc();