>Everyone" knows that leap years occur on year divisible by 4 ('first rule'). Actually, I think that's the only rule most people know. I think the "funny stor

>Everyone" knows that leap years occur on year divisible by 4 ('first rule'). Actually, I think that's the only rule most people know. I think the "funny story" is actually the opposite: most people were treating 2000 as an ordinary every-4-year leap year, did not know about the 100 divisor, but were inadvertently saved by the 400 divisor. The Wikipedia link does document some cases of what you say (yes on the 2nd rule, omitting the 3rd rule) but I think there were far, far more cases of simply assuming only the 1st rule applied.