troubleshooting Question

Running Clock Script

Avatar of Bob Schneider
Bob SchneiderFlag for United States of America asked on
72 Comments2 Solutions37 ViewsLast Modified:
I received this script for a running clock utility from this site and it is awesome...except that it starts at 00:00 each time I open the page.  I need it to display the running time from a pre-determined time (lngRaceStartTime).  I can't figure out why that is not happening.  I tried submitting specific values rather than a variable but it always starts at 00:00.  Any help would be much appreciated!

            <h1 class="bg-danger" style="text-align:center;">
                <span id="timer-minutes"></span>:<span id="timer-seconds"></span>
                class Timer {
                    constructor(startedTime, min, secs) {
                        this.startedTime = startTime;
                        this.minutes = min;
                        this.seconds = secs;
                        this.intervalTimer = false;

                    stop() {

                    start() {
                        this.intervalTimer = setInterval(this.tick.bind(this), 1000)

                    render(time) {
                        const min = Math.floor(time / 60);
                        const secs = time - (min * 60);
                        this.minutes.innerText = ("00" + min).substr(-2);
                        this.seconds.innerText = ("00" + secs).substr(-2);

                    tick() {
                        const nowSeconds = Math.floor( / 1000);
                        const time = nowSeconds - this.startedTime;

                // Only do this once, without jQuery - not on every tick
                const min_el = document.getElementById('timer-minutes');
                const secs_el = document.getElementById('timer-seconds');

                // Set your start time here - outside of your class - your class should
                // only operate on what it is given (Dependency Injection)
                const startTime = sessionStorage.getItem(<%=lngRaceStart%>) || Math.floor( / 1000);
                timer = new Timer(startTime, min_el, secs_el)

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