Yes but in virtually the rest of the world it's the 11th of December. The US is one of the few countries to use the format mm-dd-yy, Most use dd-mm-yy.
Not this crap again. Use YYYY-MM-DD. Then nobody would be confused. There's even a ISO spec saying it's the preferred format. (And before you say it, no, nobody uses YYYY-DD-MM, it's not a valid format anywhere.