[tz] CCTZ time zone library for C++ from Google

Bradley White bww at acm.org
Wed Oct 28 21:09:08 UTC 2015

On Wed, Oct 28, 2015 at 11:52 AM, Brian Inglis <
Brian.Inglis at systematicsw.ab.ca> wrote:

> On 2015-10-21 13:34, Tim Parenti wrote:
>> FYI, last month, Google released and open-sourced cctz <
>> https://github.com/google/cctz>, a new time zone library for C++.
>> My favorite quote from the announcement <
>> http://google-opensource.blogspot.com/2015/09/introducing-cctz-simple-time-zone.html>
>> on their Open Source Blog:
>>     /"Time zones are logical and easy to use." —no one ever/
> Don't think that project will help much, as the zone is not part of the
> opaque structure, but is a separate parameter in their API: that won't
> cause many problems! ;^>

I'm not sure what that means precisely, but I'm happy to discuss it.

For what it's worth, at the conceptual level cctz is mostly just a C++
binding akin to TZ's newctime(3) functions.  They both provide support for:

civil_time = f(absolute_time, time_zone)
absolute_time = g(civil_time, time_zone)

In cctz, f() and g() are spelled BreakTime() and MakeTime() respectively.
In TZ they are localtime_rz() and mktime_z().

> If we think back 15+ years, many problems were due to messing around with
> sub-chunks of dates, whether string, integer, or bits, instead of using the
> APIs provided to convert from one date representation to another. Is it
> September again in the date/time domain?
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