https://kiverix.net/scripts/clock_tick.js

1const tickSound = new Audio("/sounds/tick.wav");
2const tockSound = new Audio("/sounds/tock.wav");
3
4tickSound.volume = 0.5;
5
6tickSound.preload = "auto";
7tockSound.preload = "auto";
8
9let lastTickTime = 0;
10let lastRemainingSeconds = null;
11
12function playTickAndTock() {
13    const nowPerf = performance.now();
14    const now = new Date();
15
16    if (nowPerf - lastTickTime >= 900) {
17        tickSound.currentTime = 0;
18        tickSound.play().catch(() => {});
19        lastTickTime = nowPerf;
20    }
21
22    const midnight = new Date(
23        now.getFullYear(),
24        now.getMonth(),
25        now.getDate() + 1,
26        0, 0, 0, 0
27    );
28
29    let remaining = midnight - now;
30    if (remaining < 0) remaining = 0;
31
32    const remainingSeconds = Math.floor(remaining / 1000);
33
34    if (
35        lastRemainingSeconds !== null &&
36        lastRemainingSeconds > 0 &&
37        remainingSeconds === 0
38    ) {
39        tockSound.currentTime = 0;
40        tockSound.play().catch(() => {});
41    }
42
43    lastRemainingSeconds = remainingSeconds;
44}
45
46playTickAndTock();
47setInterval(playTickAndTock, 1000);