I work internationally occasionally, and converted myself to yyyy-mm-dd (ISO8601:2004, to give it its proper name) many years ago for the sorting, processing and unambiguity benefits. About a billion people in China use it too. And the Chinese style of writing addresses has merits: Country, Province, City, District, Street, Building, Floor, Apartment, Person.
All my dates in my other FH software are in it, and I use it in Wikitree biography timelines.
The important aspect is being 'monotonic', that is consistently big to small, or small to big, but not a mixture.