In the background for this decision lies my deep and profound antipathy and loath for torrents and torrenting. No need to comment, it's just my subjective opinion, the occasional legal no-problems torrent does not compensate the malware infected, illegal cracked content most of the torrents are.
Just by reading the post on this forum I don't see any reason to try the leaked version. Hopefully MS will release a new build this week.
It's better to first select month, then you know how many days are valid. It would make most sense to do Year/Month/Day, and in that way you would know about leap years as well, but of course nobody does that.
It all boils down to efficiency though... When you write it out... most people write "February 28th, 2015", even in Europe and other countries from what I can tell. Yes, I've seen "28th day of February, 2015" but almost never "28th Feburary, 2015". This is the way most people think about it in my experience, rather than numerically.
Honestly, those that write Day/Month/Year, do you think of it that way? Or do you think of the month first?
As an aside Hungarians always use YMD and always call people by family name first then christian name. Much more sensible really but I guess it depends on your upbringing and what you are used to.
I have two mother tongues, coming from a bilingual family. In Finnish today is "15. maaliskuuta 2015", in Swedish "15. mars 2015". In my daily language of my adopted home country Germany today is "15. März 2015".
All these three translates to "15th of March 2015", the dot after the 15 meaning it's an ordinal, 15th instead of plain 15. (BTW, it's not a typo: in Finnish and Swedish, the months are written with lower case.)
I also speak two other Scandinavian languages, Danish and Norwegian. In Norwegian it's the same as above (without the dot after the ordinal) "15 mars 2015". Only in Danish it's the "American" way, "Marts 15, 2015".
Some other languages I speak enough to know this: In Dutch today is "15 maart 2015", in Italian "15 marzo 2015" and in Spanish "15 de marzo 2015".
Speaking of sorting... if you're just sorting month day, then Month/Day works better as well. Otherwise you get
as opposed to
That may seem fine, but intersperse other months..
It gets to be a huge mess...