# tc39/proposal-temporal

Provides standard objects and functions for working with dates and times.

Repository: https://github.com/tc39/proposal-temporal
Canonical: https://ross.abutalabs.com/products/proposal-temporal
Homepage: https://tc39.es/proposal-temporal/docs/
Language: HTML
License: NOASSERTION
License Family: other
Last push: 2026-07-27T22:03:29+00:00

## Health v2 (maintenance only)
Score: 65/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 94, release rhythm 8, longevity 100
- inputs: {"age_days": 3462, "days_push": 37, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3709, forks 177 (observed 2026-08-28T04:08:15.159056+00:00)

## What it is
The TC39 Temporal proposal, a Stage 4 ECMAScript standard adding a modern date and time API to JavaScript as a global namespace object with immutable types for dates, times, durations, and timezone-aware values. The repository hosts the specification text, documentation, cookbook, and a polyfill, and will be archived once merged into ECMA-262/ECMA-402.

## Use cases
- work with dates and times in javascript without the legacy Date pitfalls
- do timezone-aware and DST-safe date arithmetic
- parse and format ISO 8601 / RFC 3339 date-time strings
- support non-Gregorian calendars like Hijri or Nepali
- convert timestamps between time zones
- schedule meetings across time zones
- represent date-only or time-only values without implicit timezone assumptions
- replace moment.js or date-fns with a built-in API

## When to choose
- you need a standards-track, immutable date/time API in JavaScript with first-class time zone and calendar support
- you are targeting environments where Temporal is shipped (Firefox 139+, Chrome 144+, Node 26+) or can use the polyfill
- you want DST-safe arithmetic and strict string parsing instead of legacy Date quirks

## When to avoid
- you only target runtimes without Temporal support and cannot ship a polyfill
- you need leap-second precision, which Temporal intentionally ignores
- you need a mature third-party library ecosystem with plugins beyond what the standard API provides

## Facets
- artifact type: library
- maturity: stable
- function: date-time
- domain: programming-languages, developer-tools
- platform: browser, cross-platform
- tags: ecmascript, tc39, javascript, temporal, timezones, calendars, dst, polyfill, language-proposal, stage-4, localization, nodejs

## Member repositories
- tc39/proposal-temporal (main) score 65

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:15.159056+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:30:56.341187+00:00, confidence not recorded.
  - readme: https://github.com/tc39/proposal-temporal (fetched 2026-08-28T04:08:15.159056+00:00, sha 1352e39df566)
  - homepage: https://tc39.es/proposal-temporal/docs/ (fetched 2026-08-29T09:24:30.826063+00:00, sha ed3e02c69349)
  - site_page: https://tc39.es/proposal-temporal/docs/cookbook.html (fetched 2026-08-29T09:24:30.858248+00:00, sha 86da5eedbdf9)
  - site_page: https://tc39.es/proposal-temporal/docs/timezone.html (fetched 2026-08-29T09:24:30.862026+00:00, sha aa5cdf0f5bd5)
  - site_page: https://tc39.es/proposal-temporal/docs/now.html (fetched 2026-08-29T09:24:30.864276+00:00, sha 57abb6ce5426)
  - site_page: https://tc39.es/proposal-temporal/docs/instant.html (fetched 2026-08-29T09:24:30.866147+00:00, sha 0ca74b2a6c95)
  - site_page: https://tc39.es/proposal-temporal/docs/zoneddatetime.html (fetched 2026-08-29T09:24:30.868614+00:00, sha ae18a6750d5a)
  - site_page: https://tc39.es/proposal-temporal/docs/plaindate.html (fetched 2026-08-29T09:24:30.872280+00:00, sha 758daab378a7)
  - site_page: https://tc39.es/proposal-temporal/docs/plaintime.html (fetched 2026-08-29T09:24:30.875241+00:00, sha 07bb61a507f5)
  - site_page: https://tc39.es/proposal-temporal/docs/plaindatetime.html (fetched 2026-08-29T09:24:30.877866+00:00, sha 26b785e1862a)
- Data as of 2026-08-30T08:39:29.467469+00:00.