Red:mm-dd-yyyy Blue:dd-mm-yyyy Yellow:yyyy-mm-dd Green:dd-mm-yyyy & yyyy-mm-dd http://en.wikipedia.org/wiki... - Simon

Yellow is the one true format!! - Amit Patel

And don't forget my home and native land, a muddy color because all three conventions are used there. - Scott of Two Countries

Go RED! - τorƍue

I use YYYY-MM-DD for file naming, so that it sorts automatically for me. For normal communication with other USians, I use MM/DD/YYYY. - Ladybug Heather

Since many US websites support the "blue" format, are you, American rebels, often confused with the "red" one? - Jérôme Flipo

+1 to yyyy-mm-dd Heather. That's about the only one I can think of any logical argument for. Looks like only east asia has this right. - Joel Webber

i propose we start using yyyy-dd-mm just to mess things up properly ;-) (not really - *votes for yyyy-mm-dd) - immaterial

Go yellow, since it sorts well. :-) - Brian Johns

yyyy-mm-dd - ISO8601 FTW! For everything else I think that the blues outnumber the reds. ;-) - Andy Bold

They forgot a small region in silicon valley where they represent the date in seconds since epoch, formatted as n,nnn,nnn,nnn - Chris Lamprecht

Red is a real anomaly here -- why in god's name do we insist on sorting these things completely weirdly in the US? Month first, seriously? Drives me nuts. - Joel Webber

@Joel - and we still measure length in inches & feet, weight in pounds, etc. It's kind of embarrassing. - Chris Lamprecht

yellow makes most sense....still it would be an "anomaly" on this map - Chris Hofmann

Amit, agree but so used to the blue format of course. - Kol Tregaskes

I've never understood the red format, didn't realise it was US only though. - Kol Tregaskes

Madagascar's date format is Blue:dd-mm-yyyy - Thierry R. Andriamirado

red format follows how many people say the date "July 10, 2009". For day to day communication with people, the blue "10th July, 2009" makes sense because the day will change more freqently than any other. For the best logic and system use, the yellow "2009, July 10th" is the best especially when you look at how we use the rest of the time denominations (23 hours, 22 minutes, 21 seconds ad nausium). - alphaxion

I hate date formats. How many years finding bugs in other people's code where a particular date format is simply assumed? User entered '10/7/2009' so is that 10th of July or 7th of October? Can't rely on regional settings as the number of times that's been set incorrectly or not set at all because it's a remote connection beggars belief. And then there's the code that didn't realise that SQL Server was storing in native US format so every time it was read and rewritten to the database it flipped over. Hate. - Mark H