Day, Month, Year.
What is the logic behind this, Month, Day, Year, nonsense? :tongue:
While I love the humorous tone of this whole thread, I'm going to take a stab at a serious answer to the OP's question.
I've pondered the same thing, and I believe it has a deeply human answer. We tend to think (or reference, if you will) in terms of calendar months. Thus, the date is too fine an increment to have immediate meaning, and the year is often too large. Most events we speak of in the present occur within the past, current or future year. Otherwise, we begin by saying, "Back in 1992..."
For example, in common conversation it fixes relevant facts in the listener's mind more quickly to hear "We got back from our cruise on October 15th" (relevant point being that speaker was away on a cruise in October) rather than "We got back from our cruise on 15 October" (date is presented first, but it's not really helpful information -- one has to wait for the month to grasp it in the mind).
A more striking example comes up with the perverse way that Gannett newspapers (which includes USAToday) number their pages. Any normal newspaper has pages like A-5, C-1 and D-10. Thus you know which section to go to first, then which page to go to. Gannett numbers its pages 5A, 1C and 10D. Inexplicably stupid and contrarian.
While reciting numbers from finest increment to most general increment makes mathematically logical sense, it is not necessarily the most "human" way to think about or express dates. Ditto addresses; Russian postal guidelines dictate that from top to bottom the address lines read:
Country
City-Postcode
Street-Housenumber
Apartment or Unit
Addressee's name
One could argue that this is inherently more logical than Western addresses, because it goes from most general to most specific, exactly how the post is handled. Is it "better" than our system? More, or less, "human"?
This "way of thinking about things" also underlies many Americans' resistance to adopting the metric system. Measurements like meters, kilos and litres seem sterile to many here, who prefer feet, pounds and gallons for their roots in the sizes of real, everyday things. I propose a middle ground, in which we use the metric measurements and a base of 10, yet incorporate the historical names for familiar sizes. Thus, we'll have meters, but a foot can be exactly one-quarter (or one-third) of a meter. A pound can be half a kilo. A gallon can be 5 (or 4) litres.
I incorporate my middle ground idea into date usage. In writing I usually use the 15 April 2010 format, in speech I always say April 15th, and when labeling things like photo collections I use 2010-04-15, since year is most relevant for retrieving archives, then month, then day.
I agree there's no real right or wrong, but I still get confused when I hear people say "our daughter's birthday is on 25 July". There are 12 "25's" in the year, but only one July.