One word: Ambiguity. We need to either have a standard and stick to it, or a small handful of standards that cannot be confused for each other. DD/MM/YYYY and MM/DD/YYYY can be confused for each other, so the nonsensical MM/DD/YYYY should move over and make room for DD/MM/YYYY, or we should drop both and just use YYYY-MM-DD.
One word: Ambiguity. We need to either have a standard and stick to it, or a small handful of standards that cannot be confused for each other. DD/MM/YYYY and MM/DD/YYYY can be confused for each other, so the nonsensical MM/DD/YYYY should move over and make room for DD/MM/YYYY, or we should drop both and just use YYYY-MM-DD.
ISO 8601 for life.
Or DD-MMM-YYYY. Like 05/OCT/2005, which is my favorite if I don’t need it to be entirely numerical.
That’s fine because it’s unambiguous. If I’m using another standard and you’re using that, I can correct it without having to think about it.