Looks like you select the month to display on the calendar page based on the time at a central location rather than the selected time zone of the user - it's 6 pm here in U.S. Central time on December 31, but I'm already seeing the January calendar. It's still highlighting Dec. 31 anyway.
Not a major issue. Just thought you might like to know.
Based on a previous issue with the calendar, I'll report that starting the calendar on Sun/Mon doesn't have any effect on this.
