A couple days ago after people had time to look through the new Android 4.2
update, it came to light that the People app had somehow removed December from the calendar
. The issue didn't affect the Calendar app, but it did make it difficult to set up birthdays or anniversaries in December. Well, good news! Google has confirmed that December does exist, and there is a fix in the works.
Google didn't say exactly when there would be an update fix for the problem, but the post acknowledging the issue would like you all to know that if you have a birthday or anniversary in December, it "won't be forgotten by your friends and family."