Цикличный таймер обратного отсчета

$('#clock').countdown('2020/10/10', function(event) { 
  var $this = $(this).html(event.strftime('' + 
    '<span>%w</span> weeks ' + 
    '<span>%d</span> days ' + 
    '<span>%H</span> hr ' + 
    '<span>%M</span> min ' + 
    '<span>%S</span> sec')); 
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-countdown/2.0.2/jquery.plugin.min.js"></script> 
<link href="https://cdnjs.cloudflare.com/ajax/libs/jquery-countdown/2.0.2/jquery.countdown.min.css" rel="stylesheet"/> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-countdown/2.0.2/jquery.countdown.min.js"></script> 
<div id="clock"></div>