countdown_silvester.html

<div  id="countdown_silvester"
   style="background:black; font-size:40pt; text-align:center;
          padding: 50px 0; color: white; line-height: 1em;">
00:00:00
</div>
<script type="text/javascript">
var cdEl = document.getElementById("countdown_silvester");
var curDate = new Date();
var trgDate = new Date(curDate.getFullYear()+1, 0, 1, 0, 0, 0);
window.setInterval(function(){
  curDate = new Date();
  var s = parseInt((trgDate.getTime() - curDate.getTime()) / 1000);
  var m = parseInt(s / 60); s -= m * 60;
  var h = parseInt(m / 60); m -= h * 60;
  cdEl.innerHTML = formatNumber(h, 2) + ":" + formatNumber(m, 2) + ":" + formatNumber(s, 2);
},1000);
function formatNumber(d, len) {
  while (d.length<len) d = "0" + d;
  return d;
}
</script>