count down clock in javascript

index.tsx
// Set the date you're counting down to
const countDownDate = new Date("Sep 30, 2021 23:59:59").getTime();

// Update the count down every 1 second
const x = setInterval(function() {

  // Get the current time
  const now = new Date().getTime();

  // Calculate the remaining time
  const distance = countDownDate - now;

  // Calculate days, hours, minutes, and seconds
  const days = Math.floor(distance / (1000 * 60 * 60 * 24));
  const hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  const minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
  const seconds = Math.floor((distance % (1000 * 60)) / 1000);

  // Display the remaining time in a DIV element
  document.getElementById("countdown").innerHTML = days + "d " + hours + "h "
  + minutes + "m " + seconds + "s ";

  // If the countdown is finished, display a message
  if (distance < 0) {
    clearInterval(x);
    document.getElementById("countdown").innerHTML = "EXPIRED";
  }
}, 1000);
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