Nah it took like 350 years for everyone to switch

Russia did it in 1918, but there were a bunch of other countries between 1582 and then.

The funniest (to me) is Alaska which switched in 1867 when Russia sold it to the US.

I've seen a short list before of a few things programmers really shouldn't try to implement themselves, and I forget what the other 2-3 were, but times and dates was definitely one of them. It's so incredibly nuanced, I'm impressed anyone gets it right.

Tom Scott made a funny video about that

Are you sure? A lost week would mean a lost pay period so payroll wouldn’t cut a check, even salaried.