Generic date formatting in date_input

[hansthen]

Checklist

• [X] I have searched the existing issues for similar feature requests.
• [X] I added a descriptive title and summary to this issue.

Summary

I would like a more generic format specification for the date_input's format parameter. E.g. "MMDD" or "DD" should also be supported or formats with different separators.

Why?

Users ask for it. In one specific use case, users can select a year and/ or a month from a select box. If those are selected, the view will show all the data for the selected year and month. They can also select a specific date, in which case the year and month selectboxes should be updated to match. In the current implementation the users see the year and month twice.

How?

No response

Additional Context

No response

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