[jira] [Commented] (ARROW-13168) [C++] Timezone database configuration and access

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-13168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17499596#comment-17499596 ] 

Joris Van den Bossche commented on ARROW-13168:
-----------------------------------------------

I suppose we mainly care about {{tzdata}} and not {{pytz}} for Python (going forward, since that is what the standard library uses), however that seems to also use the binary form (https://pypi.org/project/tzdata/)

> [C++] Timezone database configuration and access
> ------------------------------------------------
>
>                 Key: ARROW-13168
>                 URL: https://issues.apache.org/jira/browse/ARROW-13168
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Rok Mihevc
>            Assignee: Will Jones
>            Priority: Major
>              Labels: timestamp
>
>  Note: currently timezone database is not available on windows so timezone aware operations will fail.
> We're using tz.h library which needs an updated timezone database to correctly handle timezoned timestamps. See [installation instructions|https://howardhinnant.github.io/date/tz.html#Installation].
> We have the following options for getting a timezone database:
>  # local (non-windows) OS timezone database - no work required.
>  # arrow bundled folder - we could bundle the database at build time for windows. Database would slowly go stale.
>  # download it from IANA Time Zone Database at runtime - tz.h gets the database at runtime, but curl (and 7-zip on windows) are required.
>  # local user-provided folder - user could provide a location at buildtime. Nice to have.
>  # allow runtime configuration - at runtime say: "the tzdata can be found at this location"
> For more context see: [ARROW-12980|https://github.com/apache/arrow/pull/10457] and [PEP 615|https://www.python.org/dev/peps/pep-0615/#sources-for-time-zone-data].



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