Simple Countdown to Date/Time

countdown-to-date.html

<!-- Example setup of HTML for countdown number -->

<div><span id="days"></span> Days</div>
<div><span id="hours"></span> Hours</div>
<div><span id="minutes"></span> Minutes</div>
<div><span id="seconds"></span> Seconds</div>

countdown-to-date.js

(function () {
  const endDate = "10/01/2023";
  const second = 1000;
  const minute = second * 60;
  const hour = minute * 60;
  const day = hour * 24;

  const countDown = new Date(endDate).getTime(),
    x = setInterval(function () {
      const now = new Date().getTime();
      const distance = countDown - now;

      (document.getElementById("days").innerText = Math.floor(distance / day)),
        (document.getElementById("hours").innerText = Math.floor(
          (distance % day) / hour
        )),
        (document.getElementById("minutes").innerText = Math.floor(
          (distance % hour) / minute
        )),
        (document.getElementById("seconds").innerText = Math.floor(
          (distance % minute) / second
        ));
    }, 0);
})();