Comment by nulagrithom

I don't understand this one:

> If I wait exactly one second, Unix time advances by exactly one second

How does UTC jumping around affect this? If a leap second is removed it doesn't mean you've waited 0 seconds.

I feel like this is wrong too:

> If there’s a leap second in a day, Unix time either repeats or omits a second as appropriate to make them match.

It's not Unix time doing that. It's UTC.