...so you can change your date format in the system...
I don't necessarily want the real short numerical date format for the entire system - in most places that have more space, I'm happy with a format that uses words. When words are used, American order is fine for the English, because it's clear which is the day and month. But when I want to use a numerical format it's not as obvious, because Europe does D/M/Y and America does M/D/Y. So I'd rather go with the Japanese order, not only because we are here in Japan (and in Japanese, people will be even more confused to not see the year first), but also because nowhere in the world does Y/D/M, so there would be no confusion as long as I use a 4-digit year.
Can you tell me where your date format choices are stored? I could either change one of the existing choices to suit my needs or add mine to the list. I expected it to be a language file, but there is no language file for the module (or at least I couldn't find one) and the one for the component doesn't have date formats. I normally try to avoid editing code (because the next version upgrade will overwrite my customizations), but from what I can understand, changing the system date format to my liking also involves editing files (en-GB.ini and ja-JP.ini) instead of just changing a parameter, so it would have the same issue.