jQuery Countdown - https://jsfiddle.net/jimmyLi/adzcu5ff/

countdown.html

<table class="countdown" cellpadding="0" cellspacing="0">
  <tbody>
    <tr>
      <td>25-12-2017 12:00</td>
    </tr>
  </tbody>
</table>

<script>
  $('.countdown').each(function(index){
    var elm = $(this);
    var date =  $(this).find('td').html();
    var d = date.slice(0, 10).split('-');
    var h = date.slice(11, 16).split(':');
    var theDays = d[0];
    var theMonths = d[1];
    var theYears = d[2];
    var theHours = h[0];
    var theMinutes = h[1];
    var theDate = theMonths+'/'+theDays+'/'+theYears+' '+theHours+':'+theMinutes;
    console.log(theDate);

    var end = new Date(theDate);
    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);
        $('.countdown').html('DONE!');
        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);

      $('.countdown').html(days + 'D ' + hours + 'H ' + minutes + 'M ' + seconds + 'S ');
    }
    timer = setInterval(showRemaining, 1000);
  });
</script>