JavaScript analog clock

index.html

<script src="https://cdn.linearicons.com/free/1.0.0/svgembedder.min.js"></script>
<div class="frame">
  <svg class="lnr lnr-moon"><use xlink:href="#lnr-moon"></use></svg>
  <svg class="lnr lnr-sun"><use xlink:href="#lnr-sun"></use></svg>
  <div class="clock">
    <div class="clock-face">
      <div class="clock-face-numbers">
        <span class="top">12</span>
        <span class="right">3</span>
        <span class="bottom">6</span>
        <span class="left">9</span>
      </div>
      <div class="hand-pivot"></div>
      <div class="hand hand-hr"></div>
      <div class="hand hand-min"></div>
      <div class="hand hand-sec"></div>
    </div>
  </div>
</div>

javascript-analog-clock.markdown

JavaScript analog clock

An analog clock that changes its background depending on the time of the day. I used linear icons to help indicate AM and PM time. See all the subtle changes one it 6pm. I used pure javascript for clock functionality.

A Pen by Paul on CodePen.

License.

script.js

const frame = document.querySelector('.frame');
const moon = document.querySelector('.lnr-moon');
const sun = document.querySelector('.lnr-sun');
const clockShadow = document.querySelector('.clock');
const secHand = document.querySelector('.hand-sec');
const minHand = document.querySelector('.hand-min');
const hrHand = document.querySelector('.hand-hr');
const allHands = document.querySelectorAll('.hand');

function setTime() {
  const now = new Date();
  
  //return sec according to local time
  const seconds = now.getSeconds();
  //associate the degree for each sec
  const secDegrees = ((seconds / 60) * 360) + 90;
  secHand.style.transform = `rotate(${secDegrees}deg)`;
  
  //return min according to local time
  const minutes = now.getMinutes();
  //associate the degree for each min
  const minDegrees = ((minutes / 60) * 360) + 90;
  minHand.style.transform = `rotate(${minDegrees}deg)`;
  
  //return hr according to local time
  const hours = now.getHours();
  //associate the degree for each hr
  const hrDegrees = ((hours / 12) * 360) + 90;
  hrHand.style.transform = `rotate(${hrDegrees}deg)`;
  //change frame background for night and day
  if(hours >= 18 || hours <= 5) {
    frame.classList.remove('day');
    frame.classList.add('night');
    moon.style.visibility = 'visible';
    moon.style.opacity = '1';
    sun.style.visibility = 'hidden';
    sun.style.opacity = '0';
    clockShadow.style.boxShadow = '12px -6px 8px 2px rgba(0, 0, 0, 0.5)';
  } else {
    frame.classList.remove('night');
    frame.classList.add('day');
    moon.style.visibility = 'hidden';
    moon.style.opacity = '0';
    sun.style.visibility = 'visible';
    sun.style.opacity = '1';
    clockShadow.style.boxShadow = '-12px -6px 8px 2px rgba(0, 0, 0, 0.5)';
  }
  
  //remove transition when secHand reaches full cycle then re-apply the transition to 90deg
  if(secDegrees === 444 || secDegrees === 90) {
    allHands.forEach(hand => hand.style.transition = 'none');
  } else {
    allHands.forEach(hand => hand.style.transition = '');
  }
}

setInterval(setTime, 1000);

style.scss

.frame {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 460px;
  height: 460px;
  margin-top: -200px;
  margin-left: -200px;
  border-radius: 2px;
	box-shadow: 4px 8px 16px 0 rgba(0,0,0,0.1);
  background: #4CA1AF;
	overflow: hidden;
  color: #333;
	font-family: 'Open Sans', Helvetica, sans-serif;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
  
  &.day {
    background: #4CA1AF;  /* fallback for old browsers */
    background-image: url(https://images.unsplash.com/photo-1494548162494-384bba4ab999?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ);
    background-position: center;
    background-size: cover;
  }
  
  &.night {
    background: #4B79A1;  /* fallback for old browsers */
    background-image: url(https://images.unsplash.com/photo-1419242902214-272b3f66ee7a?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ);
    background-position: center;
    background-size: cover;
  }
  
  .lnr {
    display: inline-block;
    position: absolute;
    fill: currentColor;
    width: 2em;
    height: 2em;
    vertical-align: -0.05em;
    padding: 10px;
  }

  .lnr-moon {
    top: 10px;
    color: #fff;
    font-size: 42px;
  }
  
  .lnr-sun {
    color: #fff;
    font-size: 60px;
    right: 0px;
  }
}

.clock {
  width: 80%;
  height: 80%;
  border-radius: 50%;
  margin: 25px auto;
  position: relative;
  padding: 1.5rem;
  background: #ad5389;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to top, #3c1053, #ad5389);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to top, #3c1053, #ad5389); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
  box-shadow: 0px 12px 6px 2px rgba(0, 0, 0, 0.5);

  &-face {
    position: absolute;
    width: 80%;
    height: 80%;
    border: 5px solid #fff;
    border-radius: 50%;
    top: 9%;
    left: 9%;
    
    &-numbers span {
      position: absolute;
      font-size: 2rem;
      color: #fff;
    }  
    
    .top {
      left: 45%;
    }
    
    .right {
      top: 46%;
      right: 1%;
    }
    
    .bottom {
      bottom: .5%;
      left: 48%;
    }
    
    .left {
      top: 45%;
      left: 1%;
    }
    
    .hand {
      width: 50%;
      height: 6px;
      background-color: #fff;
      position: absolute;
      top: 50%;
      transform-origin: right;
      transform: rotate(90deg);
      transition: all 0.05s cubic-bezier(0, 0, 0.52, 2.51) 0s;
      
      &-pivot {
        position: absolute;
        width: 20px;
        height: 20px;
        background: #fff;
        border: 2px solid #fff;
        border-radius: 50%;
        top: 47%;
        left: 47%;
        z-index: 2;
      }
      
      &-hr {
        left: 10.5%;
        height: 10px;
        width: 40%;
      }
      
      &-min {
        left: 5.5%;
        width: 45%;
      }
      
      &-sec {
        background-color: rgba(255, 255, 255, 0.6);
      }
    }
  }
}