Analog Clock with HTML, CSS & JavaScript

01/19/2021

Demo

Video

Code

HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>Analog Clock with HTML, CSS & JavaScript</title>
    <link rel="stylesheet" type="text/css" href="style.css">
  </head>
  <body>
    <div class="clock">
      <div id="hour"></div>
      <div id="minute"></div>
      <div id="second"></div>
    </div>
    <script src="clock.js"></script>
  </body>
</html>

CSS

@charset "utf-8";
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100vh;
  background-color: #112c4f;
}
.clock {
  position: relative;
  width: 300px;
  height: 300px;
  background-image: url(clock.png);
  background-position: center;
  background-size: 100%;
  background-repeat: no-repeat;
}
.clock::before {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 999;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: #3d3935;
  content: '';
}
#hour {
  position: absolute;
  top: 25%;
  left: calc(50% - 4px);
  transform-origin: bottom;
  width: 8px;
  height: 25%;
  border-radius: 4px 4px 0 0;
  background-color: #112c4f;
}
#minute {
  position: absolute;
  top: 15%;
  left: calc(50% - 3px);
  transform-origin: bottom;
  width: 6px;
  height: 35%;
  border-radius: 3px 3px 0 0;
  background-color: #e9c277;
}
#second {
  position: absolute;
  top: 8%;
  left: calc(50% - 1px);
  transform-origin: bottom;
  width: 2px;
  height: 42%;
  border-radius: 1px 1px 0 0;
  background-color: #d73659;
}
@media screen and (max-width: 480px) {
  .clock {
    width: 200px;
    height: 200px;
  }
}

JavaScript

const hour = document.getElementById("hour");
const minute = document.getElementById("minute");
const second = document.getElementById("second");

function clock() {
  const d = new Date();
  const hr = d.getHours();
  const min = d.getMinutes();
  const sec = d.getSeconds();

  const hrDeg = 30 * hr + min / 2;
  const minDeg = 6 * min;
  const secDeg = 6 * sec;

  hour.style.transform = `rotate(${hrDeg}deg)`;
  minute.style.transform = `rotate(${minDeg}deg)`;
  second.style.transform = `rotate(${secDeg}deg)`;
}

setInterval(clock, 1000);