I'm in the US and have had problems with C-level douches misreading dd-mm-yyyy dates in some system we had that logged in that format and freaking out (and also missing that the log time stamps were in UTC-0, causing further confusion/freakout)

Anyway, this is part of why I always use yyyy-mm-dd, because nobody will confuse that date string for any other date, and everyone who can understand dates at all will be able to read it.