Christmas is cancelled by Google
ANDROID CHRISTMAS? Don't be stupid. Google have cancelled Christmas! Well, they've cancelled it about as much as those non-Christians have every year, according to the Daily Mail.
See, what's happened here is that Android 4.2 (on phones and tablets) doesn't recognise December. If you want to put someone's birthday into your phone, you won't be able to. Pretty bad news for anyone who can't remember Baby Jesus' birthday.
Google may as well get Santa and piss in his face.
That said, it does seem like Google are aware of this and will no doubt be working on a fix and rolling out an update so your phone isn't living in an 11 month year, but when that will happen, nobody knows.
Maybe Google forgot to pay their way because they'd set a reminder for December, but it didn't show up?