YDM is very rare; according to Wikipedia, only found in Kazakhstan, Latvia, Nepal, and Turkmenistan, and even in those countries it commonly coexists with other formats.
I believe internationally that YMD and DMY are the two most common formats (and also the most logical), and the (much less logical) MDY comes third… YDM is a very distant fourth. MYD, DYM are theoretically possible but doubt anybody uses them
Actually, although MDY is by far most common in the US, I’ve seen US federal government forms that use DMY instead (although I imagine that’s rare, I’m sure you’ll find DMY US govt forms are greatly outnumbered by MDY ones)
I can't even see how someone could get to a format with the year in the middle. In uses where you don't need to specify the year you might use either MD or DM, and when adding the year you could put Y either on the front or back of either of those.
I believe internationally that YMD and DMY are the two most common formats (and also the most logical), and the (much less logical) MDY comes third… YDM is a very distant fourth. MYD, DYM are theoretically possible but doubt anybody uses them
Actually, although MDY is by far most common in the US, I’ve seen US federal government forms that use DMY instead (although I imagine that’s rare, I’m sure you’ll find DMY US govt forms are greatly outnumbered by MDY ones)