[nshepperd]

"Does not count leap seconds" has to win some kind of award for misleading terminology. I'd wager it's responsible for a significant portion of leap second bugs due to confusion & misunderstanding about what Unix time is:

It sounds like what it means is that Unix time counts the number of real, actual, by-the-clock seconds that have passed since the epoch. That would be logical. But what it actually means is that it counts the number of real, actual, by-the-clock seconds, minus the number of those those that have been designated "leap seconds".

That is to say, whenever a "leap second" occurs, the nice monotonic isotonic progress of unix time is mutilated by suddenly adding or removing 1 to the total count so far. That's what "does not count leap seconds" means, and sometimes even what "ignores leap seconds" means (which is of course even worse terminology).

[wyager]

Shit, you're right. It had me totally fooled.