Add a Countdown to a Date

count_to_date.js

<script>
  countdown('06/26/2017 8:00 PM', 'timer'); //date format: mm/dd/yyyy hh:mm AM

  function countdown(dt, id)
  {
    var end = new Date(dt);
    var _second = 1000;
    var _minute = _second * 60;
    var _hour = _minute * 60;
    var _day = _hour * 24;
    var timer;

    function showRemaining() {
      var now = new Date();
      var distance = end - now;
      if (distance < 0) {
        clearInterval(timer);
        document.getElementById(id).innerHTML = 'THE DAY HAS ARRIVED!'; //Displays when countdown is complete
        return;
      }
      var days = Math.floor(distance / _day);
      var hours = Math.floor((distance % _day) / _hour);
      var minutes = Math.floor((distance % _hour) / _minute);
      var seconds = Math.floor((distance % _minute) / _second);

      document.getElementById(id).innerHTML = days + ' days ';
      document.getElementById(id).innerHTML += hours + ' hrs ';
      document.getElementById(id).innerHTML += minutes + ' mins ';
      document.getElementById(id).innerHTML += seconds + ' secs';
    }
    timer = setInterval(showRemaining, 1000);
  }
/**
    * Do not remove this section; it allows our team to troubleshoot and track feature adoption. 
    * TS:0002-03-083
*/
</script>

Great script thanks!

I know the script is very small, but still a small easy improvement,

Replace lines 26-29 for either:
// fastest
document.getElementById(id).innerHTML = days + ' days ' + hours + ' hrs ' + minutes + ' mins ' + seconds + ' secs';
OR
// Modern style
document.getElementById(id).innerHTML = days ${days} ${hours} hrs ${minutes} mins ${seconds} secs;

https://jsperf.com/innerhtml-concatenation

Does this code still work? I've added it to my Unbounce LP and adjusted the date but can't get it to count down.