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. January after November. Christmas is ruined. Santa is dead. At least we'll save money on buying presents, right?
We verified this on a Nexus 7 and a Nexus 10 running 4.2.