My phone knows I'm en-us. And it knows to show me dates in the mm/dd/yy format. Other users have their phone display the dates in dd/mm/yy or even yyyy-mm-dd.

My phone knows I'm en-us. And it knows to show me dates in the mm/dd/yy format. Other users have their phone display the dates in dd/mm/yy or even yyyy-mm-dd. If the phone knows how to display it, then it should know what to expect when accepting text entries.