digikam thumbnail date format

I’m trying out digikam (v8.7.0) for photo management, mostly liking it a lot. One thing I’d like to change is the date format in thumbnails: dates are shown in US format (mm/dd/yy), which I dislike intensely. I’d like to change it to something sane, like yyyy/mm/dd.

One way to improve this, at least on Linux, is by modifying the locale digikam is running under:

$ LC_TIME=POSIX digikam

results in dates being displayed as “29 Aug 2025”, which is acceptable.

Does anyone know a better way to configure how thumbnail dates are displayed?