I had a code below show count up timer. How can I get calculate to get day?
function a() {
  var time;
  time = 0;
  setInterval((function () {
    var hour, min, sec, str;
    time++;
    var sec = time % 60;
    var min = (time - sec) / 60 % 60;
    var hour = (time - sec - (min * 60)) / 3600;
    var count = hour + ':' + ('0' + min).slice(-2) + ':' + ('0' + sec).slice(-2);
    $('.response-time').html(count);
  }), 1000);
};
a();<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="response-time"></div> 
    