The date fields are not rendered in the collection table correctly.
'date_format' => 'd.n.Y',
"Beginn" is the default date field from the filename. "Ende" is an added field.

I know, there is a format setting inside the date field. But if I change this, I'm getting an error.
So I don't know, if this field is for backend or frontend.
Good point on this one. The _intention_ of the date_format setting was just the "publish date", or default system date field. Need to look at how we resolve that with a format setting on the field, and check that error too. Thanks for the heads up!
Another non-American here having similar problems - I'm not sure if this is related to the above or a separate issue, I've changed the date format in config/statamic/cp.php to 'd/m/Y' but datepicker dates are still showing America style:

Also noticed that error when trying to set the date format on the field itself
@timack Did you change the time_format in config/statamic/system.php too?
Normally this should work.

@Pfeifakopf thanks for the tip but it didn't make a difference for me


Related to #2053
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Please keep this issue alive. For true localisation this is critical. So confusing to UK clients to read dates in US (or even ISO) format.
I've added a PR for the CP listings, #3264.
Another non-American here having similar problems - I'm not sure if this is related to the above or a separate issue, I've changed the date format in
config/statamic/cp.phpto 'd/m/Y' but datepicker dates are still showing America style:
Also noticed that error when trying to set the date format on the field itself
Regarding the date fieldtype mentioned above, I think the date fieldtype actually has it's own date format setting you can use for that, see screenshot.
If that's not working as expected, please create another issue as I don't really think it's related to this one.

Since this issue is about the format within listings, and Duncan has fixed it in #3264, I've opened another issue for the fieldtype display issue in the form itself here: #3265
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Please keep this issue alive. For true localisation this is critical. So confusing to UK clients to read dates in US (or even ISO) format.