1710429 - Implement Extended TimeZoneName Options for Intl.DateTimeFormat

Status: RESOLVED FIXED

(Core :: JavaScript: Internationalization API, enhancement, P3)

Description

[Yulia Startsev [:yulia] OOO until July 2026]

See proposal: https://github.com/tc39/proposal-intl-extend-timezonename/

Currently stage 2.

Comment 1

[André Bargull [:anba]]

Attachment: Bug 1710429: Implement "Extended TimeZoneName Options for Intl.DateTimeFormat" proposal. r=yulia!

Implement the proposal from https://github.com/tc39/proposal-intl-extend-timezonename.

Also includes some basic tests to cover the four new options.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/1dc0676764f0
Implement "Extended TimeZoneName Options for Intl.DateTimeFormat" proposal. r=yulia

Comment 3

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/1dc0676764f0

Comment 4

[Hamish Willee]

Hi, I'm documenting this for FF91. The docs part is here: https://github.com/mdn/content/pull/6853. I still need to add browser compatibility information (all docs work can be tracked in https://github.com/mdn/content/issues/6710)

A question, in the proposal it refers to "localised" and "generic non-local forms". I know what localised means, but what does "non-local" mean?

Comment 5

[André Bargull [:anba]]

That term stems from https://unicode.org/reports/tr35/tr35-dates.html#dfst-zone, which has definitions for:

• specific non-location format
• generic non-location format
• generic location format.

So "non-location" simply refers to not using the name of the time zone identifier's location. For example "Pacific Time" for the time zone "America/Los_Angeles" instead of using "Los Angeles Time".

Comment 6

[Hamish Willee]

Thank you. That was my assumption but I was confused because if you do timezone America/Los_Angeles for German then the shortGeneric is Los Angeles Zeit on FF91. That link is helpful because it shows that there are fallbacks that are location based. Thanks!

Comment 7

[Hamish Willee]

FYI FF91 docs work is still waiting on browser compatibility update to complete but is otherwise good. If interested see docs PR and this release note PR.