Add DateTimeFormat timeZone option accepting UTC offset#29563
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isemanjski wants to merge 1 commit intomdn:mainfrom
Open
Add DateTimeFormat timeZone option accepting UTC offset#29563isemanjski wants to merge 1 commit intomdn:mainfrom
DateTimeFormat timeZone option accepting UTC offset#29563isemanjski wants to merge 1 commit intomdn:mainfrom
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Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs). |
caugner
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DateTimeFormat timeZone option accepting UTC offset
caugner
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Apr 30, 2026
| } | ||
| } | ||
| }, | ||
| "utc_offset": { |
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Nit: Prefix with accepts_.
Suggested change
| "utc_offset": { | |
| "accepts_utc_offset": { |
| }, | ||
| "utc_offset": { | ||
| "__compat": { | ||
| "description": "UTC offset in `options.timeZone` option", |
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Nit: Avoid duplication.
Suggested change
| "description": "UTC offset in `options.timeZone` option", | |
| "description": "UTC offset in `timeZone` option", |
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This PR is excellent with the screenshots providing evidence for when this shipped. @semanjski Please have a look at the failing lint check when you have a moment. 🙏 |
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Summary
Add missing compatibility information for using a UTC offset string (for example,
"+01:00") as thetimeZoneoption ofIntl.DateTimeFormat.Example:
This behavior was standardized in ECMA-402 11th Edition (June 2024).
Supporting details
This feature is not consistently documented in browser or runtime release notes, so version history was determined using a combination of public sources and manual verification.
Confirmed implementation references:
https://bugzilla.mozilla.org/show_bug.cgi?id=1856291
https://developer.apple.com/documentation/safari-release-notes/safari-17_4-release-notes
https://chromium.googlesource.com/chromium/src/+/052b9f3d67f02c7f5127d2b3257b9764363784c5
Verification performed
Browser versions (desktop browsers) were manually tested using BrowserStack. JavaScript runtimes were verified locally.
Browser verification
Chrome 119 (suppor missing)
Chrome 120 (support added)
Edge 119 (support missing)
Edge 120 (support added)
Firefox 120 (support missing)
Firefox 121 (support added)
Opera 105 (support missing)
Opera 106 (support added)
Safari 17.3 (support missing)
Safari 18.4 (support added)
Note: There is no 17.4 version available in BrowserStack so I used next one available, but release notes from Safari 17.4 are enough.
Runtime verification
Bun 1.0.18 (support missing) / Bun 1.0.19 (support added)
Deno 1.37 (support missing) / Bun 1.38 (support added)
Node.js 21.7.3 (support missing) / Node.js 22.0.0 (support added)
