let overridetime = undefined;
//overridetime = Date.now();

// Saturday at 23:00 UTC, the event starts
const startTime = overridetime ?? Date.parse('Sat, 29 Oct 2022 23:00:00');

const timeToOffset = (hours) => {
    const speed1 = -10;
    const speed2 = -31;
    if (hours <= 0) return 0;
    if (hours >= 25) return 24*speed1 + speed2;
    if (hours <= 2) {
        return hours * speed1;
    } else if (hours > 2 && hours < 3) {
        return 2*speed1 + (hours-2) * speed2;
    } else {
        return 2*speed1 + speed2 + (hours-3) * speed1;
    }
};

const update = () => {
    const now = Date.now();
    const hoursPassed = (now-startTime) / 1000 / 3600;
    // test speed here
    const offset = timeToOffset(hoursPassed);
    const timeline = document.getElementById("timeline");
    timeline.style.strokeDashoffset = 314 + offset;
};

update();
setInterval(update, 50);