[tz] C++20 time library

Howard Hinnant howard.hinnant at gmail.com
Tue Sep 21 17:18:03 UTC 2021

On Sep 21, 2021, at 12:59 PM, Paul Eggert <eggert at cs.ucla.edu> wrote:
> On 9/21/21 9:29 AM, Howard Hinnant wrote:
>> Agreed that the link part of the database may be zero-sized on some platforms.
> That's fine, but could a note or footnote be added to that effect? For example, the text should make it clear that even given the same tzdb version, the same entry could be a Zone on one platform and a Link on another.

I’ll see what I can do.

>> This part of the library is specified to be interoperable with Unix Time (http://eel.is/c++draft/time.clock.system#overview-1).  Thus leap seconds are excluded by design.
> Ah, OK. Unfortunately that's not obvious from the text, which has an extensive discussion of leap seconds.
> I suggest adding some text that makes it clear that the leap second interfaces are only for interrogating tzdb, and that leap seconds are not used by the conversion functions. For example, it should be clear what conversion functions do when given a tzdb entry that has leap seconds - do they ignore the leap seconds, or report an error, or what?

The “right” form of the tzdb should not be used for C++.


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