How to display a digital clock using HTML, CSS, and JavaScript?

This article will understand how to create a digital clock using HTML, CSS, and JavaScript. A digital clock is a type of clock that displays the time digitally.

Following are the examples of the digital clock using html, CSS, and javascript.

Example 1:

<! DOCTYPE html>
<html lang = "en">
<head>
  <meta charset = "UTF-8">
  <meta name = "viewport" content = "width=device-width, initial-scale=1.0">
  <meta http-equiv = "X-UA-Compatible" content = "ie=edge">
  <title> How to display a digital clock using HTML, CSS and JavaScript?
 </title>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.10.1/jquery.min.js"> </script>
		<script src = "https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.0.0/moment.min.js"> </script>	
<style>
body {
text-align: center;
}
a {
	outline: none;
	color: #389dc1;
}
a:visited {
	outline: none;
	color: #389dc1;
}
a:hover {
	text-decoration: none;
}
section, footer, header, aside {
	display: block;
}
#clock {
	width: 370px;
	padding: 40px;
	margin: 100px auto 60px;
	position: relative;
}
#clock:after {
	content: ' ';
	position: absolute;
	width: 400px;
	height: 20px;
	border-radius: 100%;
	left: 50%;
	margin-left: -200px;
	bottom: 2px;
	z-index: -1;
}
#clock .display {
	text-align: center;
	padding: 40px 20px 20px;
	border-radius: 6px;
	position: relative;
	height: 54px;
}
#clock.light {
	background-color: #f3f3f3;
	color: #272e38;
}
#clock.light:after {
	box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}
#clock.light .digits div span {
	background-color: #272e38;
	border-color: #272e38;	
}
#clock.light .digits div.dots:before {
	background-color: #272e38;
}
#clock.light .digits div.dots:after {
	background-color: #272e38;
}
#clock.light .alarm {
	background:url('../img/alarm_light.jpg');
}
#clock.light .display {
	background-color: #dddddd;
	box-shadow: 0 1px 1px rgba(0,0,0,0.08) inset, 0 1px 1px #fafafa;
}
#clock.dark {
	background-color: #272e38;
	color: #cacaca;
}
#clock.dark:after {
	box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}
#clock.dark .digits div span {
	background-color: #cacaca;
	border-color: #cacaca;	
}
#clock.dark .alarm {
	background:url('../img/alarm_dark.jpg');
}
#clock.dark .display {
	background-color: #0f1620;
	box-shadow: 0 1px 1px rgba(0,0,0,0.08) inset, 0 1px 1px #2d3642;
}
#clock.dark .digits div.dots:before {
	background-color: #cacaca;
}
#clock.dark .digits div.dots:after {
	background-color: #cacaca;
}
#clock .digits div {
	text-align: left;
	position: relative;
	width: 28px;
	height: 50px;
	display: inline-block;
	margin: 0 4px;
}
#clock .digits div span {
	opacity: 0;
	position: absolute;
	-webkit-transition: 0.25s;
	-moz-transition: 0.25s;
	transition: 0.25s;
}
#clock .digits div span:before {
	content: ' ';
	position: absolute;
	width: 0;
	height: 0;
	border: 5px solid transparent;
}
#clock .digits div span:after {
	content: ' ';
	position: absolute;
	width: 0;
	height: 0;
	border: 5px solid transparent;
}

#clock .digits .d1 {			
height: 5px;
width: 16px;
top: 0;
left: 6px; }
#clock .digits .d1:before {	
border-width: 0 5px 5px 0;
border-right-color: inherit;
left: -5px; }
#clock .digits .d1:after {	
border-width: 0 0 5px 5px;
border-left-color: inherit; right: -5px;
}
#clock .digits .d2 {			
height: 5px;
width: 16px;
top: 24px;
left: 6px; }
#clock .digits .d2:before {	
border-width: 3px 4px 2px;
border-right-color: inherit;
left: -8px; }
#clock .digits .d2:after {	
border-width: 3px 4px 2px;
border-left-color: inherit;
right: -8px; }
#clock .digits .d3 {			
height: 5px;
width: 16px;
top: 48px; 
left: 6px; }
#clock .digits .d3:before {	
border-width: 5px 5px 0 0;
border-right-color: inherit;
left: -5px; }
#clock .digits .d3:after {	
border-width: 5px 0 0 5px;
border-left-color: inherit; right: -5px; }

#clock .digits .d4 {			
width: 5px;
height: 14px; 
top: 7px; left: 0; 
}
#clock .digits .d4:before {	
border-width: 0 5px 5px 0;
border-bottom-color: inherit;
top: -5px; }
#clock .digits .d4:after { 
border-width: 0 0 5px 5px;
border-left-color: inherit;
bottom: -5px; }
#clock .digits .d5 {			
width: 5px;
height: 14px; 
top: 7px; 
right: 0; }
#clock .digits .d5:before {	
border-width: 0 0 5px 5px;
border-bottom-color: inherit; 
top: -5px; }
#clock .digits .d5:after {	
border-width: 5px 0 0 5px; 
border-top-color: inherit;
bottom: -5px; }
#clock .digits .d6 {			
width: 5px;
height: 14px;
top: 32px; 
left: 0; }
#clock .digits .d6:before {	
border-width: 0 5px 5px 0;
border-bottom-color: inherit;
top: -5px; }
#clock .digits .d6:after {	
border-width: 0 0 5px 5px;
border-left-color: inherit;
bottom: -5px; }
#clock .digits .d7 {			
width: 5px;
height: 14px; 
top: 32px;
right: 0; }
#clock .digits .d7:before {	
border-width: 0 0 5px 5px;
border-bottom-color: inherit; 
top: -5px; }
#clock .digits .d7:after {	
border-width: 5px 0 0 5px;
border-top-color: inherit;
bottom: -5px; }
#clock .digits div.one .d5 {
	opacity: 1;
}
#clock .digits div.one .d7 {
	opacity: 1;
}
#clock .digits div.two .d1 {
	opacity: 1;
}
#clock .digits div.two .d5 {
	opacity: 1;
}
#clock .digits div.two .d2 {
	opacity: 1;
}
#clock .digits div.two .d6 {
	opacity: 1;
}
#clock .digits div.two .d3 {
	opacity: 1;
}
#clock .digits div.three .d1,
#clock .digits div.three .d5,
#clock .digits div.three .d2,
#clock .digits div.three .d7,
#clock .digits div.three .d3 {
	opacity: 1;
}
#clock .digits div.four .d5,
#clock .digits div.four .d2,
#clock .digits div.four .d4,
#clock .digits div.four .d7 {
	opacity: 1;
}
#clock .digits div.five .d1,
#clock .digits div.five .d2,
#clock .digits div.five .d4,
#clock .digits div.five .d3,
#clock .digits div.five .d7 {
	opacity: 1;
}
#clock .digits div.six .d1,
#clock .digits div.six .d2,
#clock .digits div.six .d4,
#clock .digits div.six .d3,
#clock .digits div.six .d6,
#clock .digits div.six .d7 {
	opacity: 1;
}



#clock .digits div.seven .d1,
#clock .digits div.seven .d5,
#clock .digits div.seven .d7 {
	opacity: 1;
}
#clock .digits div.eight .d1,
#clock .digits div.eight .d2,
#clock .digits div.eight .d3,
#clock .digits div.eight .d4,
#clock .digits div.eight .d5,
#clock .digits div.eight .d6,
#clock .digits div.eight .d7 {
	opacity: 1;
}
#clock .digits div.nine .d1,
#clock .digits div.nine .d2,
#clock .digits div.nine .d3,
#clock .digits div.nine .d4,
#clock .digits div.nine .d5,
#clock .digits div.nine .d7 {
	opacity: 1;
}
#clock .digits div.zero .d1,
#clock .digits div.zero .d3 {
	opacity: 1;
}
#clock .digits div.zero .d4 {
	opacity: 1;
}
#clock .digits div.zero .d5 {
	opacity: 1;
}
#clock .digits div.zero .d6 {
	opacity: 1;
}
#clock .digits div.zero .d7 {
	opacity: 1;
}
#clock .digits div.dots {
	width: 5px;
}
#clock .digits div.dots:before {
	width: 5px;
	height: 5px;
	content: ' ';
	position: absolute;
	left: 0;
	top: 14px;
}
#clock .digits div.dots:after {
	width: 5px;
	height: 5px;
	content: ' ';
	position: absolute;
	left: 0;
	top: 14px;
}
#clock .digits div.dots:after {
	top: 34px;
}
#clock .alarm {
	width: 16px;
	height: 16px;
	bottom: 20px;
	background: url('../img/alarm_light.jpg');
	position: absolute;
	opacity: 0.2;
}
#clock .alarm.active {
	opacity: 1;
}
#clock .weekdays {
	font-size: 12px;
	position: absolute;
	width: 100%;
	top: 10px;
	left: 0;
	text-align: center;
}
#clock .weekdays span {
	opacity: 0.2;
	padding: 0 10px;
}
#clock .weekdays span.active {
	opacity: 1;
}
#clock .ampm {
	position: absolute;
	bottom: 20px;
	right: 20px;
	font-size: 12px;
}
.button-holder {
	text-align: center;
	padding-bottom: 100px;
}
a.button {
	background-color: #f6a7b3;
	background-image: -webkit-linear-gradient(top, #f6a7b3, #f0a3af);
	background-image: -moz-linear-gradient(top, #f6a7b3, #f0a3af);
	background-image: linear-gradient(top, #f6a7b3, #f0a3af);
	border: 1px solid #eb9ba7;
	border-radius: 2px;
	box-shadow: 0 2px 2px #ccc;
	color: #fff;
	text-decoration: none !important;
	padding: 15px 20px;
	display: inline-block;
	cursor: pointer;
}
a.button:hover {
	opacity: 0.9;
}
footer {
	width: 770px;
	font: normal 16px Arial, Helvetica, sans-serif;
	padding: 15px 35px;
	position: fixed;
	bottom: 0;
	left: 50%;
	margin-left: -420px;
	background-color:#1f1f1f;
	background-image: -webkit-linear-gradient(top, #1f1f1f, #101010);
	background-image: -moz-linear-gradient(top, #1f1f1f, #101010);
	background-image: linear-gradient(top, #1f1f1f, #101010);
	border-radius: 2px 2px 0 0;
	box-shadow: 0 -1px 4px rgba(0,0,0,0.4);
	z-index:1;
}
footer a.tz {
	font-weight: normal;
	font-size: 16px !important;
	text-decoration: none !important;
	display: block;
	margin-right: 300px;
	text-overflow: ellipsis;
	white-space: nowrap;
	color: #bfbfbf !important;
	z-index: 1;
}
footer a.tz:before {
	content: ' ';
	background: url('http://cdn.tutorialzine.com/misc/enhance/v2_footer_bg.png') no-repeat 0 -53px;
	width: 138px;
	height: 20px;
	display: inline-block;
	position: relative;
	bottom: -3px;
}
footer .close {
	position: absolute;
	cursor: pointer;
	width: 8px;
	height: 8px;
	background: url('http://cdn.tutorialzine.com/misc/enhance/v2_footer_bg.png') no-repeat 0 0px;
	top: 10px;
	right: 10px;
	z-index: 3;
}
footer #tzine-actions {
	position: absolute;
	top: 8px;
	width: 500px;
	right: 50%;
	margin-right: -650px;
	text-align: right;
	z-index: 2;
}
h1  {
  line-height: 2em; 
  padding-bottom: 5px;
  text-transform: none;
  font-size: 1.7em;
 font-weight: bold;
  font-style: italic;
 font-family: "Lucida Console", "Courier New", monospace;
  color: #999; 
  letter-spacing: -0.005em;
  word-spacing: 1px;
  letter-spacing: none;
}
h2  {
  margin-top: 40px;
  text-transform: none;
  font-size: 1.75em;
  font-weight: bold;
  font-family: "Lucida Console", "Courier New", monospace;
  color: #999; 
  letter-spacing: -0.005em; 
  word-spacing: 1px;
  letter-spacing: none;
}
footer #tzine-actions iframe {
	display: inline-block;
	height: 21px;
	width: 95px;
	position: relative;
	float: left;
	margin-top: 11px;
}
</style>
<body>
<h1> Example </h1>
<h2> How to display a digital clock using HTML, CSS and JavaScript? </h2>
<div id = "clock" class = "light">
			<div class = "display">
				<div class = "weekdays"> </div>
				<div class = "ampm"> </div>
				<div class = "alarm"> </div>
				<div class = "digits"> </div>
			</div>
		</div>
		<div class = "button-holder">
			<a class = "button"> Switch Theme </a>
		</div>
<script>
$(function() {
    var clock = $('#clock'),
        alarm = clock.find('.alarm'),
        ampm = clock.find('.ampm');
        var digit_to_name = 'zero one two three four five six seven eight nine'.split(' ');
    var digits = {};
    var positions = [
        'h1', 'h2', ':', 'm1', 'm2', ':', 's1', 's2'
    ];
    var digit_holder = clock.find('.digits');
    $.each(positions, function(){
        if(this == ':') {
            digit_holder.append('<div class="dots">');
        }
        else {
            var pos = $('<div>');
            for(var i=1; i<8; i++) {
                pos.append('<span class="d' + i + '">');
            }
            digits[this] = pos;
            digit_holder.append(pos);
        }
    });
    var weekday_names = 'MON TUE WED THU FRI SAT SUN'.split(' '),
        weekday_holder = clock.find('.weekdays');
    $.each(weekday_names, function() {
        weekday_holder.append('<span>' + this + '</span>');
    });
    var weekdays = clock.find('.weekdays span');
    (function update_time() {
        var now = moment().format("hhmmssdA");
        digits.h1.attr('class', digit_to_name[now[0]]);
        digits.h2.attr('class', digit_to_name[now[1]]);
        digits.m1.attr('class', digit_to_name[now[2]]);
        digits.m2.attr('class', digit_to_name[now[3]]);
        digits.s1.attr('class', digit_to_name[now[4]]);
        digits.s2.attr('class', digit_to_name[now[5]]);
         var dow = now[6];
        dow--;
        if(dow < 0) {
            dow = 6;
        }    weekdays.removeClass('active').eq(dow).addClass('active');
        ampm.text(now[7]+now[8]);
        setTimeout(update_time, 1000);
    })();
    $('a.button').click(function() {
        clock.toggleClass('light dark');
    });
});
</script>
</body>
</html>

Explanation:

In the above example, we have created an example of a digital clock using html, CSS, and javascript. We can also change the theme according to your choice, i.e., light or dark.

Output:

Following is the output of this example.

How to display a digital clock using HTML, CSS, and JavaScript?

Example 2:

<! DOCTYPE html>
<html lang = "en">
<head>
  <meta charset = "UTF-8">
  <meta name = "viewport" content = "width=device-width, initial-scale=1.0">
  <meta http-equiv = "X-UA-Compatible" content = "ie=edge">
  <title> How to display a digital clock using HTML, CSS and JavaScript?
 </title>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.10.1/jquery.min.js"> </script>
		<script src = "https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.0.0/moment.min.js"> </script>	
<style>
body { 
  text-align: center;
  padding: 20px;
background-color: #F8F9FA;
background-size: 1800% 1800%;
font-family: "Lucida Console", "Courier New", monospace;
-webkit-animation: rainbow 18s ease infinite;
-z-animation: rainbow 18s ease infinite;
-o-animation: rainbow 18s ease infinite;
  animation: rainbow 18s ease infinite; }
h1  {
  line-height: 2em; 
  padding-bottom: 5px;
  text-transform: none;
  font-size: 1.7em;
 font-weight: bold;
  font-style: italic;
 font-family: "Lucida Console", "Courier New", monospace;
  color: #999; 
  letter-spacing: -0.005em;
  word-spacing: 1px;
  letter-spacing: none;
}
h2  {
  margin-top: 40px;
  text-transform: none;
  font-size: 1.75em;
  font-weight: bold;
  font-family: "Lucida Console", "Courier New", monospace;
  color: #999; 
  letter-spacing: -0.005em; 
  word-spacing: 1px;
  letter-spacing: none;
}
.clock {
    position: absolute;
    top: 50%;
    left: 50%;
	 padding-top: 15px;
    transform: translateX(-50%) translateY(-50%);
    color: #17D4FE;
    font-size: 60px;
    font-family: Orbitron;
    letter-spacing: 7px;
}
</style>
<body>
<h1> Example </h1>
<h2> How to display a digital clock using HTML, CSS and JavaScript? </h2>
<div id = "MyClockDisplay" class = "clock" onload = "showTime()"> </div>
<script>
function showTime(){
    var date = new Date();
    var h = date.getHours();
    var m = date.getMinutes();
    var s = date.getSeconds();
    var session = "AM";
    if(h == 0) {
        h = 12;
    }
    if(h > 12) {
        h = h - 12;
        session = "PM";
    }
    h = (h < 10) ? "0" + h : h;
    m = (m < 10) ? "0" + m : m;
    s = (s < 10) ? "0" + s : s;
    var time = h + ":" + m + ":" + s + " " + session;
    document.getElementById("MyClockDisplay").innerText = time;
    document.getElementById("MyClockDisplay").textContent = time;
    setTimeout(showTime, 1000);
}
showTime();
</script>
</body>
</html>

Explanation:

In the above example, we have created an example of a digital clock using html, CSS, and javascript.

Output:

Following is the output of this example.