Month/Day/Year. Why fix what isn't broken?
MDY is broken.
Oh? Why do you say that?
Because it is not consistently Big Endian or Little Endian. Would you want time expressed as mm:ss:hh?
By themselves either DD-MM-YYYY vs YYYY-MM-DD are good, but the latter is the slightly better date format simply because time is consistently written in Big Endian format, so it makes some sense to be Big Endian there as well.
(It would be nice if internet addresses were also consistently big endian. This site really should be org.uselectionatlas not uselectionatlas.org but that ain't gonna happen now, even tho some early computer network schemes did use such an idea.)