I have this code :
$(document).ready(function(){
        $("#CDT")
            .countdown("{{ aReturn.sAuctionEndDate }}", function(event) {
                $(this).html(
                    event.strftime('' +
                            '<span class="number-wrapper" style="float: left"><div class="line"></div><div class="caption">Day</div><span class="number day">%D</span></span>' +
                            '<span class="number-wrapper" style="float: left"><div class="line"></div><div class="caption">Hour</div><span class="number hour">%H</span></span>' +
                            '<span class="number-wrapper" style="float: left"><div class="line"></div><div class="caption">Minute</div><span class="number min">%M</span></span>' +
                            '<span class="number-wrapper" style="float: left"><div class="line"></div><div class="caption">Second</div><span class="number sec">%S</span></span>')
                );
            });
    });
But I don't know how to know when the countdown ends. Can you help me please?
 
     
    