Gutenberg publish panel does not respect lowercase a in g:i a time format.

[truptikanzariya]

The Gutenberg publish/schedule panel does not fully respect the site's configured.

Steps to Reproduce:

1. Go to Dashboard → Settings → General
2. Set Time Format to: g:i a
3. Open the Block Editor (Gutenberg)
4. Check the Publish/Schedule panel time selector.

Expected Result:
The time selector should display lowercase am/pm because the selected PHP time format uses lowercase a.

Example:
12:32 pm

Actual Result:
The Gutenberg publish panel displays uppercase AM/PM instead.

Example:
12:32 PM

Additional Notes:

When using g:i A, uppercase AM/PM is correct.
When using H:i, the editor should use 24-hour format without AM/PM.

[jorbin]

I've tested on older versions, this was not introduced in 7.0 so removing the version.

Issues for the editor screen are managed in the gutenberg repo. Can you please ​report this issue there? Once that has been done, this can be closed as reported-upstream.