I get it, it's really annoying that there are different formats. In fact I once nerfed a small database by importing a bunch dates from a csv in the wrong format. But honestly both formats (M/D/Y and D/M/Y) are wrong, as clear from the clock example: dates should be big-endian; Y/M/D.
They are both "wrong" compared to big-endian, but M/D/Y is by far the least logical of the three formats. M/D/Y should never be a default for any software without the user explicitly selecting it or specifying their country.
M/D/Y seems to be the most practical because it reflects how dates are spoken in American English. It separates the date (month/day) from the year, which in many cases can be omitted, while also keeping the larger unit, the month, up front.