[tz] Temporal - ECMAScript built-in JS Library for dates/times/timezones/calendars in progress

Jase Williams jase.williams at gmail.com
Thu Mar 4 17:27:48 UTC 2021


I'm one of the TC39 (EcmaScript) delegates.
As a heads up to anyone interested, we're creating a new built-in module in
JavaScript (to hopefully replace Date()) called Temporal.
This new, rich API includes:

- First-class support for all time zones, including DST-safe arithmetic
- Strongly-typed objects for dates, times, date/time values, year/month
values, month/year values, "zoned" date/time values, and durations
- Immutability for all Temporal objects
- String serialization and interoperability via standardized formats
- Compliance with industry standards like ISO 8601, RFC 3339, and RFC5545
- Full support for non-Gregorian calendars

Feel free to play around with it and offer feedback on the repo.

The repository is here:

Documentation here:

Polyfill here:

EcmaScript spec:

It's currently Stage 2 which means it's under review, but there's hope to
see this implemented in Browsers/NodeJS soon.

For consideration in tz-link.html. Feel free to adjust wording

Project: https://github.com/tc39/proposal-temporal
NPM: https://www.npmjs.com/package/proposal-temporal

Jason Williams
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