For me personally, I am happy with the existing calendar and don't see it as a problem. What I would like to see changed is Daylight Savings Time by getting rid of it...what a PITA twice a year! That's just my 2 cents.
Yeah, I remember spending that New Years Eve sitting in a server room, with two other people, watching nothing happen and management had us stay until 3AM. It wasn't like we hadn't already tested all the servers, offline, by rolling their calendars over weeks ahead of time. There was some "magic" that would cause it to only happen when the planets were aligned just so, I guess.