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Asked: 2026-05-28T04:46:05+00:00

I finally found a nice javascript count up timer with no frills. I would

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I finally found a nice javascript count up timer with no frills. I would like to start multiple instances of the timer with different initial times to count up from. So far the only progress I’ve made is breaking the script. 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>JavaScript CountUp Timer - Praveen Lobo</title>
<script type="text/javascript">
/**********************************************************************************************
* CountUp script by Praveen Lobo (http://PraveenLobo.com/techblog/javascript-countup-timer/)
* This notice MUST stay intact(in both JS file and SCRIPT tag) for legal use.
* http://praveenlobo.com/blog/disclaimer/
**********************************************************************************************/
function CountUp(initDate, id){
    this.beginDate = new Date(initDate);
    this.countainer = document.getElementById(id);
    this.numOfDays = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];
    this.borrowed = 0, this.years = 0, this.months = 0, this.days = 0;
    this.hours = 0, this.minutes = 0, this.seconds = 0;
    this.updateNumOfDays();
    this.updateCounter();
}

CountUp.prototype.updateNumOfDays=function(){
    var dateNow = new Date();
    var currYear = dateNow.getFullYear();
    if ( (currYear % 4 == 0 && currYear % 100 != 0 ) || currYear % 400 == 0 ) {
        this.numOfDays[1] = 29;
    }
    var self = this;
    setTimeout(function(){self.updateNumOfDays();}, (new Date((currYear+1), 1, 2) - dateNow));
}

CountUp.prototype.datePartDiff=function(then, now, MAX){
    var diff = now - then - this.borrowed;
    this.borrowed = 0;
    if ( diff > -1 ) return diff;
    this.borrowed = 1;
    return (MAX + diff);
}

CountUp.prototype.calculate=function(){
    var currDate = new Date();
    var prevDate = this.beginDate;
    this.seconds = this.datePartDiff(prevDate.getSeconds(), currDate.getSeconds(), 60);
    this.minutes = this.datePartDiff(prevDate.getMinutes(), currDate.getMinutes(), 60);
    this.hours = this.datePartDiff(prevDate.getHours(), currDate.getHours(), 24);
    this.days = this.datePartDiff(prevDate.getDate(), currDate.getDate(), this.numOfDays[currDate.getMonth()]);
    this.months = this.datePartDiff(prevDate.getMonth(), currDate.getMonth(), 12);
    this.years = this.datePartDiff(prevDate.getFullYear(), currDate.getFullYear(),0);
}

CountUp.prototype.addLeadingZero=function(value){
    return value < 10 ? ("0" + value) : value;
}

CountUp.prototype.formatTime=function(){
    this.seconds = this.addLeadingZero(this.seconds);
    this.minutes = this.addLeadingZero(this.minutes);
    this.hours = this.addLeadingZero(this.hours);
}

CountUp.prototype.updateCounter=function(){
    this.calculate();
    this.formatTime();
    this.countainer.innerHTML =
        "<strong>" + this.days + "</strong> " +
        "<strong>" + this.hours + "</strong>:" +
        "<strong>" + this.minutes + "</strong>:" +
        "<strong>" + this.seconds + "</strong>";
    var self = this;
    setTimeout(function(){self.updateCounter();}, 1000);
}

window.onload=function(){ new CountUp(new Date(), 'counter'); }

</script>
</head>
<body>
<div id="counter">Contents of this DIV will be replaced by the timer</div>
</body>
</html>
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1 Answer

  1. Editorial Team

    This code will add a new counter to your HTML, each time the button is pressed:

    var counterNum = 1;    

function addCounter() {
    var div = document.createElement("div");
    div.id = "counter" + counterNum++;
    document.body.appendChild(div);
    var x = new CountUp(new Date(), div.id);
}

    with this HTML for the button:

    <button onclick="addCounter()">Add Counter</button>

    See working demo here: http://jsfiddle.net/jfriend00/NshSf/.

    Or, if you want different initial times, you can set the initial time like this:

     new CountUp(new Date() - (10*60*60*1000), div.id);   // start 10 minutes ago (time in ms)

    You can see here that the timers added by pressing the button start at 10 minutes using this code.

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