Temporal API Hits 69% Browser Support — Here's How to Decide If You Should Migrate

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The JavaScript Temporal API has reached roughly 69% global browser support as of mid-2026, with Firefox 139, Chrome 144, and Node.js 26 all shipping it natively by default. Safari remains the critical holdout, still behind a flag in Technology Preview with no release date, meaning all iOS browsers lack support regardless of the app used. Developers targeting backend or Node.js 26+ environments can adopt Temporal today without any polyfill, while browser-based projects must weigh Safari traffic share and bundle size costs before migrating. Two polyfill options exist — a ~56KB official one and a lighter ~20KB alternative — which can be loaded conditionally so only Safari users incur the download penalty. Beyond API adoption, the deeper migration challenge lies in correctly mapping existing database fields like timestamps and birthdays to the right Temporal types, as errors at the schema level can cause persistent timezone bugs.

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