JSFiddle - React, Tailwind, and code Playground

HTML

<p id="count">

</p>
<p id="counth">

</p>

JavaScript

var countDownDate = new Date("Aug 30 2023 18:00").getTime();
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 = countDownDate - now;
    
  // 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);
    
// affichage complet 
  document.getElementById("count").innerHTML = days + "j " + hours + "h "  + minutes + "m " + seconds + "s ";

//affichage partiel
  document.getElementById("counth").innerHTML = hours + "h "  + minutes + "m " + seconds + "s ";
  
  if (days === 0 && hours === 0 && minutes === 00 && seconds === 00) {
   window.location.reload();
  }
  
  
}, 1000);