JavaScript Digital Clock With 12 Hour Format

JavaScript Digital Clock With 12 Hour Format
Code Snippet:Pure Vanilla JS Clock - No BS
Author: Ian Fleming
Published: January 12, 2024
Last Updated: January 22, 2024
Downloads: 415
License: MIT
Edit Code online: View on CodePen
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Looking for a JavaScript digital clock in 12-hour format? This code, written in pure vanilla JS, creates a sleek and stylish timepiece for your webpage. The script initializes variables for hours, minutes, seconds, and AM/PM, displaying the current time in a user-friendly format.

The clock updates every second, ensuring real-time accuracy. Easily customizable, it’s perfect for adding a touch of functionality and elegance to your site.

How to Create JavaScript Digital Clock With 12 Hour Format

1. In your HTML file, create a container where you want the clock to appear. For example:

<div class='time'></div>
<h1>This is what you are looking for.</h1>
<h1>Pure Vanilla JS</h1>

Feel free to customize the styling by adding additional HTML elements and classes.

2. Apply the desired styles to your clock using the following CSS code. This example provides a simple dark theme, but you can customize it to match your website’s design:

body {
  background: black;
.time, h1 {
  font-family: Helvetica;
  font-size: 6em;
  color: white;

3. Now, add the JavaScript code to your file. Copy and paste the following script, which initializes variables for hours, minutes, seconds, and AM/PM. The displayTime function formats the time and continuously updates the clock every second.

// A simple vanilla JS clock

// Initilize variables for date, hour, minute, second, am or pm, and the final displayed time
var d, h, m, s, ampm, time;

// Your clock!
function displayTime() {
  d = new Date();
  h = d.getHours();
  m = d.getMinutes();
  s = d.getSeconds();
  ampm = h >= 12 ? 'pm' : 'am';
  h = h % 12;

  // Adds zeros to single digit times
  if (h <= 9) {
    h = '0' + h;
  if (m <= 9) {
    m = '0' + m;
  if (s <= 9) {
    s = '0' + s;

  // Assign time format to variable. If you want to change how time is displayed do it here
  // Example time = h + ":" + m;
  time = h + ":" + m + ":" + s + " " + ampm;

  // Print your clock to an element.
  document.getElementsByClassName("time")[0].innerHTML = time;

  // Refreshes clock every second. If you're just using minutes change to 60000
  setTimeout(displayTime, 1000);

// Run your baller clock!

That’s all! hopefully, you’ve successfully implemented a digital clock with a 12-hour format on your webpage. If you have any questions or suggestions, feel free to comment below.

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