JSFiddle - React, Tailwind, and code Playground

HTML

<p id="demo"></p>

JavaScript

// Set the date we're counting down to
var countDownDate = new Date("May 1, 2019 00:00:00").getTime();
 
// Update the count down every 1 second
var x = setInterval(function() {
 
  // Get today's date and time
  var now = new Date().getTime();
 
  // Find the distance between now and the count down date
  var distance = now - countDownDate;
 
  // Time calculations for days, hours, minutes and seconds
  var days = Math.floor(distance / (1000 * 60 * 60 * 24));
  var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
  var seconds = Math.floor((distance % (1000 * 60)) / 1000);
 
  // Display the result in the element with id="demo"
  document.getElementById("demo").innerHTML = days + "d " + hours + "h "
  + minutes + "m " + seconds + "s ";
 
  // If the count down is finished, write some text
  if (distance < 0) {
    clearInterval(x);
    document.getElementById("demo").innerHTML = "EXPIRED";
  }
}, 1000);