1 more hour thought experiment

[FlawlessHappiness]

This would mean Jesus Christ wasn't born the 24th/25th
The whole bible must be rewritten!

More time.. Yay.. one more hour of doing nothing.
Hey, I wouldn't mind. More time for homework too.

Would it? I don't think one hour would be added retroactively - that would be a complete mess. All of our dates would suddenly become meaningless.

Yes! New calendar.
Of course in the beginning everything would be total chaos.
Some scientists would probably be hired to figure everything out.
All the while people would either think of it as the end of the world, or try to live with it.