Countdown-clock/app.js at master · Elham13/Countdown-clock · GitHub

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setInterval(() => {
  var val = document.getElementById("date_input").value;
  var countDate = new Date(val).getTime();
  var now = new Date().getTime();
  gap = countDate - now;

  var second = 1000;
  var minute = second * 60;
  var hour = minute * 60;
  var day = hour * 24;

  var d = Math.floor(gap / day);
  var h = Math.floor((gap % day) / hour);
  var m = Math.floor((gap % hour) / minute);
  var s = Math.floor((gap % minute) / second);

  document.getElementById("day").innerText = d;
  document.getElementById("hour").innerText = h;
  document.getElementById("minute").innerText = m;
  document.getElementById("second").innerText = s;
}, 1000);