Re: [tz] [PROPOSED] zic -r is incompatible with rolling leaps

On Sep 13, 2021, at 12:18 AM, Paul Eggert via tz <tz@iana.org> wrote:

Thanks for the background.

You participated in the tz mailing list thread: http://mm.icann.org/pipermail/tz/1998-May/010164.html in which he mentioned that back in 1998: http://mm.icann.org/pipermail/tz/1998-May/010159.html (things I learned from a Web search today; no, I didn't remember that discussion, either). (And, on one of the topics you addressed in your message:

What Epoch do systems that use leap seconds use?

In practice, such systems define 1972-01-01 00:00:00Z == (time_t) 63072000, i.e. it's as if there were no leap seconds before 1972.

Presumably systems that *don't* use leap seconds use the same definition.)