We all know -- and hopefully accept -- that with any new version release of Android, there's bound to be a few little bugs hidden within. While Google will test, test and test again, there's always likely to be something that slips the net, many of which most users never come across. What we find in Android 4.2 however, definitely belongs on some kind of blooper reel. They forgot December.
Google Calendar is unaffected, so we're all good on that front. But, when adding events to profiles within your People application, there is no option to add dates in December. Loved ones birthdays, Christmas, New Years Eve, all don't exist, at least in this part of Android 4.2 anyway. We've still got a Nexus 7 lying around with Android 4.1.2 on it, and indeed over there all is well.
If nothing else, it's pretty embarrassing. The issue has been reported to the Android bug tracker, and we can imagine that a fix will be rolled out in the not too distant future.
Source: Android Police