There's a bit of international discrepancy regarding calendar date format, i.e. whether you write and say the date as "Month Day, Year" or "Day Month Year" or something different.  As with many things, America is nearly alone in referring to dates as "Month Day, Year", which is not only confusing for people who don't use the format, but also presumably illogical if you're not accustomed to it.  I think it's more of a case of familiarity than logic, but I have a hard time arguing for the other side for the following simple reason:  When naming computer files or folders, if I use the calendar date and I want to find something I worked on in June, it's difficult if I use the day first, as in: 
file-01-01 (Jan 1)
file-01-06 (Jun 1)
file-01-12 (Dec 1)
file-02-01 (Jan 2)
file-02-12 (Dec 2)
But with the month first, it becomes easy: 
file-01-01 (Jan 1)
file-01-02 (Jan 2)
file-06-01 (Jun 1)
file-12-01 (Dec 1)
file-12-02 (Dec 2)
This could all be a matter of perspective though, and the above example proves dumbfounding to a non-American. #sociology