I hope it is locale-sensitive. US is the only country that uses mainly the mm/dd/yyyy. Most of the others use dd/mm/yyyy with some important exceptions (China, Japan, Korea) with yyyy/mm/dd (which happens to be the standard: https://en.wikipedia.org/wiki/Date_format_by_country

Firefox ships ~100 localizations. (See https://www.mozilla.org/en-US/firefox/nightly/all/ for the list.) I'm pretty sure this will be handled appropriately :)

actually, it’s almost never dd/mm/yyy, but dd.mm.yyy, and yyyy-mm-dd. Japan is one of the few offenders, almost everywhere else the separator can be used to identify the format.

Australia also uses DD/MM/YYYY. You see ISO dates here and there but it's not as common.

I didn't mean about the separator at all, just the ordering. But good point.

Works on Firefox for Android