is-date-object
Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
jest-date-mock
Mock `window.Date` when run unit test cases with jest. Make tests of `Date` easier.
@js-temporal/polyfill
Polyfill for Temporal (https://github.com/tc39/proposal-temporal), an ECMA TC39 Stage 3 proposal