Timer

function timer() {
        let time, intervalID;
        let startBtn = $("#start-timer");
        let stopBtn = $("#stop-timer");
        let isPaused = false;
        startBtn.click(function () {
            if (isPaused == false) {
                time = -1;
            }
            else {
                time -= 1;
            }
            incrementTime();
            intervalID = setInterval(incrementTime, 1000);
            startBtn.attr('disabled', true);
            stopBtn.attr('disabled', false);
        });
        stopBtn.on('click', function () {
            clearInterval(intervalID);
            isPaused = true;
            startBtn.attr('disabled', false);
            stopBtn.attr('disabled', true);
        });
        function incrementTime() {
            time++;
            $("#seconds").text(('0' + (time % 60)).slice(-2));
            $("#minutes").text(('0' + Math.trunc(time / 60) % 60).slice(-2));
            $("#hours").text(('0' + Math.floor(time / 3600) % 24).slice(-2))
        }
    }