JSFiddle - React, Tailwind, and code Playground

by Adhik Bagul

HTML

<h1>Countdown Clock</h1>
		<div id="clockdiv">
		  <div>
			<span class="days"></span>
			<div class="smalltext">Days</div>
		  </div>
		  <div>
			<span class="hours"></span>
			<div class="smalltext">Hours</div>
		  </div>
		  <div>
			<span class="minutes"></span>
			<div class="smalltext">Minutes</div>
		  </div>
		  <div>
			<span class="seconds"></span>
			<div class="smalltext">Seconds</div>
		  </div>
		</div>

CSS

body{
				text-align: center;
				/*background: #00ECB9;*/
			  font-family: sans-serif;
			  font-weight: 100;
			}

			h1{
			  color: #396;
			  font-weight: 100;
			  font-size: 40px;
			  margin: 40px 0px 20px;
			}

			#clockdiv{
				font-family: sans-serif;
				color: #fff;
				display: inline-block;
				font-weight: 100;
				text-align: center;
				font-size: 30px;
			}

			#clockdiv > div{
				padding: 10px;
				border-radius: 3px;
				background: #00BF96;
				display: inline-block;
			}

			#clockdiv div > span{
				padding: 15px;
				border-radius: 3px;
				background: #00816A;
				display: inline-block;
			}

			.smalltext{
				padding-top: 5px;
				font-size: 16px;
			}

JavaScript

function getTimeRemaining(endtime) {
			  var t = Date.parse(endtime) - Date.parse(new Date());
			  var seconds = Math.floor((t / 1000) % 60);
			  var minutes = Math.floor((t / 1000 / 60) % 60);
			  var hours = Math.floor((t / (1000 * 60 * 60)) % 24);
			  var days = Math.floor(t / (1000 * 60 * 60 * 24));
			  return {
				'total': t,
				'days': days,
				'hours': hours,
				'minutes': minutes,
				'seconds': seconds
			  };
			}

			function initializeClock(id, endtime) {
			  var clock = document.getElementById(id);
			  var daysSpan = clock.querySelector('.days');
			  var hoursSpan = clock.querySelector('.hours');
			  var minutesSpan = clock.querySelector('.minutes');
			  var secondsSpan = clock.querySelector('.seconds');

			  function updateClock() {
				var t = getTimeRemaining(endtime);

				daysSpan.innerHTML = t.days;
				hoursSpan.innerHTML = ('0' + t.hours).slice(-2);
				minutesSpan.innerHTML = ('0' + t.minutes).slice(-2);
				secondsSpan.innerHTML = ('0' + t.seconds).slice(-2);

				if (t.total <= 0) {
				  clearInterval(timeinterval);
				}
			  }

			  updateClock();
			  var timeinterval = setInterval(updateClock, 1000);
			}

			var deadline = new Date(Date.parse(new Date()) + 172800000);
			initializeClock('clockdiv', deadline);