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

Guy Harris gharris at sonic.net
Mon Sep 13 07:57:26 UTC 2021

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

> Thanks for the background.

You participated in the tz mailing list thread:


in which he mentioned that back in 1998:


(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.)

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