12h/24h Digital Clock In JavaScript And CSS

A 12h/24h digital clock app for your web page, implemented in pure JavaScript and CSS.

How to use it:

Create the html for the digital clock and 12h/24h, AM/PM switchers.

<div class="wrapper">
  <div class="numbers">
    <div class="number num-hour">
      <div class="digit digit1">
        <div class="line line-top line-horizontal"></div>
        <div class="line line-left-top line-vertical"></div>
        <div class="line line-right-top line-vertical"></div>
        <div class="line line-middle line-horizontal"></div>
        <div class="line line-left-bottom line-vertical"></div>
        <div class="line line-right-bottom line-vertical"></div>
        <div class="line line-bottom line-horizontal"></div>          
      </div>
      <div class="digit digit2">
        <div class="line line-top line-horizontal"></div>
        <div class="line line-left-top line-vertical"></div>
        <div class="line line-right-top line-vertical"></div>
        <div class="line line-middle line-horizontal"></div>
        <div class="line line-left-bottom line-vertical"></div>
        <div class="line line-right-bottom line-vertical"></div>
        <div class="line line-bottom line-horizontal"></div>
      </div>
    </div>
    <span class="colon colon-minute">:</span>
    <div class="number num-minute">
      <div class="digit digit1">
        <div class="line line-top line-horizontal"></div>
        <div class="line line-left-top line-vertical"></div>
        <div class="line line-right-top line-vertical"></div>
        <div class="line line-middle line-horizontal"></div>
        <div class="line line-left-bottom line-vertical"></div>
        <div class="line line-right-bottom line-vertical"></div>
        <div class="line line-bottom line-horizontal"></div>
      </div>
      <div class="digit digit2">
        <div class="line line-top line-horizontal"></div>
        <div class="line line-left-top line-vertical"></div>
        <div class="line line-right-top line-vertical"></div>
        <div class="line line-middle line-horizontal"></div>
        <div class="line line-left-bottom line-vertical"></div>
        <div class="line line-right-bottom line-vertical"></div>
        <div class="line line-bottom line-horizontal"></div>
      </div>
    </div>
    <span class="colon colon-second">:</span>
    <div class="number num-second">
      <div class="digit digit1">
        <div class="line line-top line-horizontal"></div>
        <div class="line line-left-top line-vertical"></div>
        <div class="line line-right-top line-vertical"></div>
        <div class="line line-middle line-horizontal"></div>
        <div class="line line-left-bottom line-vertical"></div>
        <div class="line line-right-bottom line-vertical"></div>
        <div class="line line-bottom line-horizontal"></div>
      </div>
      <div class="digit digit2">
        <div class="line line-top line-horizontal"></div>
        <div class="line line-left-top line-vertical"></div>
        <div class="line line-right-top line-vertical"></div>
        <div class="line line-middle line-horizontal"></div>
        <div class="line line-left-bottom line-vertical"></div>
        <div class="line line-right-bottom line-vertical"></div>
        <div class="line line-bottom line-horizontal"></div>
      </div>
    </div>
  </div>
  <div class="footer-wrapper">
    <div class="footer footer_number1">
      <span>12h</span>
      <input type="checkbox" class="toggle-12-24" id="switch1"> 
      <label for="switch1"></label>
      <span>24h</span>
    </div>
    <div class="footer footer_number2">
      
    </div>
    <div class="footer footer_number3">
      <span>Off</span>
      <input type="checkbox" checked="checked" class="toggle-second" id="switch3"> 
      <label for="switch3"></label>
      <span>On</span>
    </div>
  </div>
</div>
<div class="ampm-wrapper">
  <span class="ampm"></span>
</div>

The primary CSS styles for the digital clock.

.numbers {
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.colon {
  font-size: 85pt;
  color: var(--blueActive);
}
.number {
  width: 250px;
  display: flex;
  justify-content: space-around;
}
.digit {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  width: 100px;
}
.line {
  display: block;
  background-color: var(--blueNotActive);
}
.line-horizontal {
  width: 100px;
  height: 10px;
}
.line-vertical {
  width: 10px;
  height: 100px;
}
/*Lighting up the correct lines to make the numbers.*/
/*0*/
.num0 .line-top, .num0 .line-right-top, .num0 .line-left-top, .num0 .line-right-bottom, .num0 .line-left-bottom, .num0 .line-bottom, 
/*1*/
.num1 .line-right-top, .num1 .line-right-bottom, 
/*2*/
.num2 .line-top, .num2 .line-right-top, .num2 .line-middle, .num2 .line-left-bottom, .num2 .line-bottom, 
/*3*/
.num3 .line-top, .num3 .line-right-top, .num3 .line-middle, .num3 .line-right-bottom, .num3 .line-bottom, 
/*4*/
.num4 .line-right-top, .num4 .line-middle, .num4 .line-left-top, .num4 .line-right-bottom, 
/*5*/ 
.num5 .line-top, .num5 .line-left-top, .num5 .line-middle, .num5 .line-right-bottom, .num5 .line-bottom, 
/*6*/
.num6 .line-top, .num6 .line-left-top, .num6 .line-middle, .num6 .line-left-bottom, .num6 .line-right-bottom, .num6 .line-bottom, 
/*7*/
.num7 .line-top, .num7 .line-right-top, .num7 .line-right-bottom, 
/*8*/
.num8 .line, 
/*9*/
.num9 .line-top, .num9 .line-left-top, .num9 .line-middle, .num9 .line-right-top, .num9 .line-right-bottom, .num9 .line-bottom {
  background-color: var(--blueActive);
  box-shadow: var(--blueBoxShadow);
}
/*Make 0, 1, 4, and 7 use corners when lighting up too*/
.num0 .line-right-top::after, .num0 .line-left-top::after, .num1 .line-right-bottom::after, .num1 .line-right-top::after, .num4 .line-right-bottom::after, .num4 .line-right-top::after, .num4 .line-left-top::after, .num7 .line-right-bottom::after, .num7 .line-right-top::after {
  content: '';
  border-top: 10px solid var(--blueActive);
  border-bottom: 10px solid var(--blueActive);
  margin-top: -10px;
  height: 100%;
  display: block;
}
.inactive .line {
  background-color: var(--blueNotActive);
  box-shadow: none;
}
.inactive .line::after { border-color: transparent; }
.colon-second.inactive { color: var(--blueNotActive); }
.footer-wrapper {
  display: flex;
  justify-content: space-between;
  color: white;
  text-align: center;
}
.footer {
  width: 250px;
  margin-top: 10px;
  display: flex;
  justify-content: space-around;
}
.footer_number1 { }
.footer_number2 { }
.footer_number3 { }
/*Pretty toggle*/
input[type=checkbox] {
  height: 0;
  width: 0;
  visibility: hidden;
  display: none;
}
label {
  cursor: pointer;
  text-indent: -9999px;
  width: 50px;
  height: 25px;
  background: var(--blueNotActive);
  display: block;
  border: 2px solid white;
  border-radius: 100px;
  position: relative;
}
label:after {
  content: '';
  position: absolute;
  top: 4px;
  left: 3px;
  width: 13px;
  height: 13px;
  background: white;
  border: 2px solid rgb(44,44,55);
  border-radius: 90px;
  transition: 0.3s;
}
input:checked + label { background: var(--blueActive); }
input:checked + label:after {
  left: calc(100% - 5px);
  transform: translateX(-100%);
}
/*AM PM*/
.ampm-wrapper { height: 300px; }
.ampm {
  color: var(--blueActive);
  font-size: 50pt;
}

Include the JavaScript file ‘script.js’ at the end of the document. Done.

<script src="scripts/script.js"></script>