function toBase62(num) {
    const base62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    let encoded = "";
    while (num > 0) {
        encoded = base62[num % 62] + encoded;
        num = Math.floor(num / 62);
    }
    return encoded;
}

function generateID() {
    const epochStart = new Date("2020-01-01").getTime(); // Epoch in ms
    const now = Date.now();
    let timestamp = (now - epochStart) % 1_000_000_000_000; // Keep last 12 digits

    let randomNum = Math.floor(Math.random() * 100); // Random 2-digit number
    let finalNum = timestamp * 100 + randomNum;

    return toBase62(finalNum).padStart(8, "0");
}

console.log(generateID()); // Example output: "A1b2C3D4"