File this one under How did Google not have a test for this? Got a birthday or anniversary in December? Sorry - Android 4.2 doesn't know what December is. Well, rather the People/Contacts app that comes stock and is part of the Android Open Source Project (AOSP) doesn't. Wait... what?
We couldn't believe it either, but it's true. Google forgot to include December. As in, there are 11 months in a year.