Date-relative (and relatively universally unique) UUID generation. Inspired by: https://www.npmjs.com/package/druuid

druuid.mjs

export const toBigInt = (value, radix = 36) => {
  return [...value.toString()].reduce((acc, val) => (acc * BigInt(radix)) + BigInt(parseInt(val, radix)), 0n);
};

export const gen = (date = Date.now()) => {
  return ((BigInt(date) << (64n - 41n)) ^ (BigInt(crypto.getRandomValues(new Uint8Array(32))
                                                        .join('')) % (2n ** (64n - 41n))));
};

export const time = (uuid) => {
  return new Date(Number((BigInt(uuid) >> (64n - 41n))));
};