I agree, but for everyday use dd/mm/yyyy is probably better.
But now I’m wondering how the date format appears to be dd/mm/yyyy (actually dd.mm.yyyy) in @tiwane’s and @misumeta’s German-language screenshots earlier in this thread.
Ah, changing the app’s “app language” (in the settings) to German changes the date format on individual observations to dd.mm.yyyy, but appears to have no effect on the (US) date format in my list of observations.
Interestingly, changing the app language to “English (UK)” from default English appears to have no effect on date format whatsoever.