I change the date format, some pages cannot be found - what to do?

I change the date format, some pages cannot be found - what to do?

I found this (scary, old) page with some complex guideline, but is that still necessary or does xwiki do it now automatically? https://www.xwiki.org/xwiki/bin/view/FAQ/Howtochangedateformat

Undo whatever changes you did and get your wiki working the way it used to.

Then, go to your wiki Administration, Content, Localization, and set the Date/Time format to your preference. See the bottom of this screenshot for an example.
Screenshot 2022-09-19 at 14.09

The faq you referenced was an answer for xwiki v1 which is a little old.

Ah, thank you @pdwalker, I already thought this should not be so difficult. I indeed had to clear my cache and no issues happened any more.
I actually did as you said, but only have the yyyy-MM-dd as format, not yyyy-MM-dd HH:mm, since I don’t want to see minute details in any pages. I suppose that this is only a display setting, and that it does not effect how a date is stored in the database.
Thanks!