comet // javascript

<script>
var curday;
var secTime;
var ticker;

function getSeconds() {
 var nowDate = new Date();
 var dy = 1 ; // CHANGE DAY: Sunday through Saturday, 0 to 6
var countertime = new Date(Date.UTC(nowDate.getUTCFullYear(),nowDate.getUTCMonth(), nowDate.getUTCDate(), 1, 0, 0)); // CHANGE TIME: change 1 to the time you need, 24 hours system, use utc time zone

 var curtime = nowDate.getTime();
 var atime = countertime.getTime();
 var diff = parseInt((atime - curtime)/1000);
 if (diff > 0) { curday = dy - nowDate.getDay() }
 else { curday = dy - nowDate.getDay() -1 }
 if (curday < 0) { curday += 7; }
 if (diff <= 0) { diff += (86400 * 7) }
 startTimer (diff);
}

function startTimer(secs) {
 secTime = parseInt(secs);
 ticker = setInterval("tick()",1000);
 tick();
}

function tick() {
 var secs = secTime;
 if (secs>0) {
  secTime--;
 }
 else {
  clearInterval(ticker);
  getSeconds();
 }

 var days = Math.floor(secs/86400);
 secs %= 86400;
 var hours= Math.floor(secs/3600);
 secs %= 3600;
 var mins = Math.floor(secs/60);
 secs %= 60;

 document.getElementById("days").innerHTML = curday;
 document.getElementById("hours").innerHTML = ((hours < 10 ) ? "0" : "" ) + hours;
 document.getElementById("minutes").innerHTML = ( (mins < 10) ? "0" : "" ) + mins;
 document.getElementById("seconds").innerHTML = ( (secs < 10) ? "0" : "" ) + secs;
}
</script>