I assume you just change to format to japanese format where its y-m-d. I tried that and still same thing.
Also tried that however, the problem was I couldn't find app and features there. I found it elsewhere and chose manage optional features, but when I clicked add a feature it showed up nothing.
Yeah I also thought that using Japanese language with Win 10 should be no problem.
I've tried Locale Emulator and although it was better than no text or one letter texts, it now shows up gibberish as if I've never changed system locale.