D M Y is a logical sequence from smallest to largest.
Y M D is a logical sequence from largest to smallest, and also the one that works best in ordering lists.
Either is acceptable.
M D, Y is as antiquated as the imperial system and deserves to be consigned to the dustbin of history along with stupid paper sizes.
@ponderable saidFor sorting, as Kewpie has suggested.
why? That is what changes daily, month and year change much less frequently.
fyi: I name documents with yy/mm/dd