[hc5]

N+9.1: Non leap years will never contain a leap day.

http://support.microsoft.com/kb/214326

[cbr]

But that's a bug in Excel. "Non leap years will never contain a leap day" is true.

[hc5]

It was a bug in Lotus 1-2-3 that was intentionally implemented into Excel, so technically it was a backwards-compatibility "feature". And some items from the original list aren't exactly "truths" as much as implementations or configurations, e.g.

> 19. The system clock will never be set to a time that is in the distant past or the far future.

> 20. Time has no beginning and no end.

[NoahSussman]

'items from the original list aren't exactly "truths" as much as implementations or configurations' QFT.

[antidoh]

For now.