Unable to set Time & Date formats independent of locale

Steps to reproduce

Unable to set Date/Time format independent of my locale. There is no option to set it, surely this must be a bug in a calendar app.

I can't imagine anyone developing a calendar software and not exposing the options to give the desired format. IF this was intentional, can any justifiable reason be given for such a glaringly obvious oversight?

Expected behavior

I should be able to set my Date format to whatever format I choose.

I should be able to set my Time format to AM/PM or 24 Hours as I desire.

Actual behavior

I can only change my locale which then changes my date/time format to undesired combinations.

Calendar app version

5.0.7

CalDAV-clients used

No response

Browser

Any

Client operating system

No response

Server operating system

No response

Web server

None

Database engine version

None

PHP engine version

None

Nextcloud version

No response

Updated from an older installed version or fresh install

None

List of activated apps

Nextcloud configuration

Web server error log

Log file

Browser log

Additional info

No response

No files, tests, or entry points are named in the issue. Start by locating the Calendar app's locale-dependent date and time formatting code and review the single existing comment for context. Done means users can choose date and 12-hour or 24-hour time formats independently of their locale, with the behavior covered by appropriate tests.