I work on software that's used globally. We've found that ISO week conventions (starts on Monday, day-month-year, week numbering as described in the article) a

I work on software that's used globally. We've found that ISO week conventions (starts on Monday, day-month-year, week numbering as described in the article) are good enough for everyone except the US. We have just two settings for our date system: ISO and US. I think the US has a peculiar attitude towards standards. You also see it with miles vs kilometers, Fahrenheit vs Celsius, and a bunch of more obscure standards particular to our industry. It takes more effort to make our software ready for the US than for the rest of the world combined. (Although admittedly we don't support right-to-left.)