[tz] Getting current tzdb version in use

[Martin Burnicki]

Howard Hinnant wrote:
> On Jul 19, 2018, at 3:33 AM, Martin Burnicki <martin.burnicki at meinberg.de> wrote:
>> BTW, does your implementation check the tzdb version on each call, or
>> only once after startup? In the latter case an updated tzdb version
>> would only be detected if a program (or the whole system) is restarted …
> 
> On first access to any call that requires a tzdb lookup, the version is looked up on the local disk and cached.
> 
> However, if the client calls reload_tzdb() (https://en.cppreference.com/w/cpp/chrono/tzdb_functions) the std::lib implementation may load a new version of the tzdb if available.

Thanks for the pointer!

Martin
-- 
Martin Burnicki

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