[tz] Preparing to fork tzdb

Howard Hinnant howard.hinnant at gmail.com
Tue Sep 21 15:57:35 UTC 2021

On Sep 21, 2021, at 11:15 AM, Jan Engelhardt <jengelh at inai.de> wrote:
> On Tuesday 2021-09-21 16:45, Howard Hinnant wrote:
>>>>>>      zoned_time zt{"America/Port-au-Prince", local_days{1957y/June/5} + 19h + 30min};
>>>>>>      cout << format("%F %T %Z", clock_cast<tai_clock>(zt.get_sys_time())) << '\n';
>>>> [...] IANA time zone names are part of the C++20 API, and pre-1970 data
>>>> is expected (best effort of course)
>>> I can't really find substance to this claim.
>>> The API [speaking of the locate_zone() function] wants a string, but it does
>>> not specify which particular string value(s)
>> In the end we believed that this sentence was the best way to
>> describe the set of time zone names:
>> http://eel.is/c++draft/time.zone#general-1
>>> [time.zone] describes an interface for accessing the IANA Time Zone Database
>>> [...]
> With a standard wording so loose, the best interpretation I can give you is that
> the minimum set of known names in C++20 is that of tzdata1996l.

Here are detailed instructions for making suggestions to improve the wording of the C++ standard.  Everyone is welcome to contribute: https://cplusplus.github.io/LWG/lwg-active.html#submit_issue

> Which may be lacking America/Port-au-Prince. (Probably not, but humour me.)

The C++20 spec also has API to inspect the version of the time zone database.


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: Message signed with OpenPGP
URL: <https://mm.icann.org/pipermail/tz/attachments/20210921/3890b9c1/signature.asc>

More information about the tz mailing list