How To Create a Countdown Timer

// Set the date we're counting down to
var countDownDate = new Date("Jan 5, 2024 15:37:25").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 = 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);
    
  //Output the result in an element with id="hours",  id="min" &  id="sec"
  document.getElementById("hours").innerHTML = hours + "h ";
  document.getElementById("min").innerHTML = minutes + "m ";
  document.getElementById("sec").innerHTML = seconds + "s ";
    
  // If the count down is over, write some text 
  if (distance < 0) {
    clearInterval(x);
    document.getElementById("hours").innerHTML = "EXPIRED";
    document.getElementById("min").innerHTML = "EXPIRED";
    document.getElementById("sec").innerHTML = "EXPIRED";
  }
}, 1000);