Use the hour cycle of the locale in timestamps

[Eugene (OEvgeny)]

Timestamps and their "Sent at" screen reader text use the 12-hour clock in every language, such as "Gesendet um 19. Oktober um 11:06 AM" in German.

Changelog Entry

Fixed

• Fixed timestamps always using the 12-hour clock, such as "4:41 PM" instead of "16:41" in German, in PR #5920, by @OEvgeny

Description

useDateFormatter used the Globalize skeleton MMMMdhm, where h forces the 12-hour clock. It now uses MMMMdjm, where j is the preferred hour cycle of the locale, so English stays "August 8 at 4:41 PM" and German becomes "8. August um 16:41".

Design

• Kept Globalize and the precompiled formatters: CLDR j is supported by the bundled data, no switch to Intl.DateTimeFormat needed.

Specific Changes

• useDateFormatter.ts, createPrecompiledGlobalize.mjs, types/PrecompiledGlobalize.ts: skeleton MMMMdhm → MMMMdjm

• timestamp/absolute.hourCycle.html: snapshot 1, "August 8 at 4:41 PM" in en-US; snapshot 2, "8. August um 16:41" in de-DE; asserts the visible and "Sent at" texts

• localization.fileUpload.polish.html: snapshot 1 updated, "6 września 8:49 PM" → "20:49"

• I have added tests and executed them locally

• I have updated CHANGELOG.md

• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.