Or humans make a mistake. I got burned by the MsDos date rollover with signed values ~20 years ago. A salesman fat-fingered a job into the 2060s. Of course while I was on the other side of the world with no phone access.

accumulated daylight savings since y2k?

The St Nicholas Orthodox church sat at the base of the Twin Towers, because it was there for 100 years and they wouldn't take the money to rebuild it elsewhere. They probably served their last Divine Liturgy there on Sunday 9/9/01 as a last blessing before it was destroyed that Tuesday.

I was on a break at work reading a lot about 9/11 for some reason. Went back to fix an easy bug where our timestamps were printing wrong dates (milliseconds vs seconds) so I became curious what dates would show up if I added zeros in front of 1, to get a ballpark of where dates are. I freaked out after the ninth zero, you know, being so close to the event I was just reading about.

Cool link though, thanks. So the worst historical event of the information age happened right at the billenium.