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A fix or two has been offered up for the bug.
For one, the bug doesn't affect the calendar itself, so users are able to add meetings, dinners, parties, etc., to their schedules through that channel. Users on forums have also noted that switching the language on affected devices to Chinese or Japanese, setting the date and then switching it back fixes the problem, too.
Google is, of course, also working on a fix. So if you think you can hold off adding December birthdays and anniversaries to your address book for a little longer, the company should provide a solution soon.