https://www.canvasworld.com/scripts/time_storage.js?c2028b032775fbac98d44132118c157281141229

1const TimedStorage = {
2  /**
3   * @param {string} key
4   * @param {any} value
5   * @param {number} ttlInSeconds
6   */
7  set(key, value, ttlInSeconds = 86400) {
8    const expiry = Date.now() + ttlInSeconds * 1000;
9    const data = JSON.stringify({ value, expiry });
10    localStorage.setItem(key, data);
11  },
12
13  /**
14   * @param {string} key
15   * @returns {any|null}
16   */
17  get(key) {
18    const raw = localStorage.getItem(key);
19    if (!raw) return null;
20
21    try {
22      const { value, expiry } = JSON.parse(raw);
23      if (Date.now() > expiry) {
24        localStorage.removeItem(key);
25        return null;
26      }
27      return value;
28    } catch {
29      localStorage.removeItem(key);
30      return null;
31    }
32  },
33
34  /**
35   * @param {string}
36   */
37  remove(key) {
38    localStorage.removeItem(key);
39  }
40};