Changes to date since v 3.31?

1

I just wanted to update kirby from 3.3.1, but I get a “days is not defined” instead of a date field in the panel of one of my pages if I use the current version. Did anything change?
The respective blueprint part looks like this:

            fields:
              date:
                label: Date
                type: date
                width: 1/2

Any help appreciated
Hagen

2

Maybe same problem as here? Date-Field with Article/Blog Posts - #6 by texnixe

3

I indeed have the k3-date-format plugin installed, I will check, whether that’s the cause.
Thx
Hagen