The way JavaScript handles time has evolved significantly, from the built-in `Date` API to Moment.js and now Temporal. The new standard fills gaps in the original `Date` API while addressing limitations found in Moment and other libraries. Joe Attardi shares practical “recipes” for migrating Moment-based code to the new Temporal API.

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A practical migration guide from Moment.js to the new JavaScript Temporal API, which reached TC39 Stage 4 and is already shipping in Chrome 144+ and Firefox 139+. Covers key differences including immutability (Temporal objects never mutate), 1-based month indexing, built-in time zone support without extra packages, and strict ISO 8601 parsing. Provides side-by-side code recipes for creating date/time objects, parsing, formatting via Intl.DateTimeFormat, date arithmetic, comparisons, and time zone conversions. Includes a real-world refactoring example of an event scheduling function. Also notes a polyfill (@js-temporal/polyfill) is available for Safari and older browsers, though it's still in alpha.

Moving From Moment.js To The JS Temporal API — Smashing Magazine