docs: format release times as HH:MM UTC

[pavan-sh]

Summary

Format the release cadence times in README.md as HH:MM in UTC (e.g. 23:59 instead of 2359) to improve readability and reduce ambiguity.

Details

The README currently lists release times as:

• Preview: UTC 2359
• Stable: UTC 2000
• Nightly: UTC 0000

This format is easy to misread while scanning. This PR updates them to standard HH:MM formatting:

• UTC 23:59
• UTC 20:00
• UTC 00:00

No behavioral change—documentation-only.

Context: I previously contributed a related README clarification PR that was merged:

• docs: format UTC times in releases doc #18169

Related Issues

Fixes #20723
Related to #18169

How to Validate

1. Open README.md
2. In the “Release Cadence and Tags” section, confirm the times read:
   • Preview: UTC 23:59
   • Stable: UTC 20:00
   • Nightly: UTC 00:00
3. Confirm there are no other occurrences of UTC 2359, UTC 2000, or UTC 0000 in the README.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed) — N/A (docs-only)
• Noted breaking changes (if any) — N/A
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the readability of release cadence information within the README.md file. By standardizing the time format from a four-digit number to a more conventional HH:MM representation, it ensures that users can quickly and accurately understand the scheduled release times for preview, stable, and nightly builds, thereby improving the overall user experience with the documentation.

Highlights

• Improved Readability: Updated the release cadence times in README.md to use the HH:MM format (e.g., 23:59) instead of HHMM (e.g., 2359) for better clarity and reduced ambiguity.
• Documentation-Only Change: This pull request is purely a documentation update and introduces no behavioral changes to the application.

Changelog

• README.md
  • Updated release times from HHMM to HH:MM format for preview, stable, and nightly releases.

Activity

• The pull request addresses and fixes issue README: release cadence UTC times should be formatted as HH:MM (clarity) #20723.
• It is related to a previously merged PR, docs: format UTC times in releases doc #18169, which also clarified README content.
• The author has confirmed that relevant documentation (README) has been updated.
• Tests were marked as not applicable as this is a documentation-only change.

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[gemini-code-assist]

Code Review

This pull request improves the readability of release times in README.md by formatting them as HH:MM UTC. The changes are correct and make the documentation clearer. As this is a documentation-only change and no critical or high-severity issues were found, I have no specific review comments. The change is good to merge.

[g-samroberts]

Thank you for your contribution, @pavan-sh!

[pavan-sh]

Thank you for your contribution, @pavan-sh!

Happy to help!