Note that it i18n isn't implemented correctly by any of the browser date pickers. Date controls aren't context sensitive like humans would write dates, they're client-culture-settings sensitive. So for anybody wanting to interact with both US sites and local sites (presumably quite a few people on the planet), they'll never be able to have appropriate browser date controls - either they get to have US controls on local sites, or local controls on US sites - and both are quite confusing, especially before you open the date control. Unopened date controls just show the client-culture-localized date, so if that doesn't match the site culture... it's going to be a mess.