JSFiddle - React, Tailwind, and code Playground

HTML

<div id="count" data-seconds="30"></div>

JavaScript

// Test harness
        setInterval(function(){
            $("#count").each(function(){
                var seconds = $(this).data('seconds');
                if(seconds > 0) {
                    second = seconds - 1;
                    $(this).data('seconds', second)
                   
                     var date = new Date(null);
                     date.setSeconds(second); 
                     $(this).html(date.toISOString().substr(14, 5))
                }
              else
                {
                  $(this).html("Reload" )
                }
            });
        }, 1000);