Колеги, ще съм признателен ако някой ми каже защо решението по-долу гърми на един тест в джъджа (83/100).

function timer() {
   let time, intervalID;
   let startBtn = $('#start-timer');
   let stopBtn = $('#stop-timer');
   startBtn.on('click',function(){
      time = -1;
      incrementTime();
      intervalID = setInterval(
         incrementTime, 1000);
      startBtn.attr('disabled',true);
      stopBtn.attr('disabled',false);

   });
   stopBtn.on('click',function () {
      clearInterval(intervalID);
      startBtn.attr('disabled',false);
      stopBtn.attr('disabled',true);

   });

   function incrementTime() {
      time++;
      let hoursSpan = $('#hours');
      let minutesSpan = $('#minutes');
      let secondsSpan = $('#seconds');

      let hours = (Math.floor( (time/(60*60)) % 24 )).toString();
      if(hours.length<2) hours="0"+hours;
      
      let minutes = (Math.floor( (time/60) % 60 )).toString();
      if(minutes.length<2) minutes="0"+minutes;

      let seconds = (Math.floor( (time) % 60 )).toString();
      if(seconds.length<2) seconds="0"+seconds;

      hoursSpan.text(hours);
      minutesSpan.text(minutes);
      secondsSpan.text(seconds);
   }
}