Rok Mihevc c48e81e4d0 GH-48593: [C++] C++20: use standard calendar / timezone APIs (#48601) ...

### Rationale for this change

Switch to std::chrono for MSVC to be able to use the system-provided timezone automatically on Windows.

### What changes are included in this PR?

This adds `chrono_internal.h` that uses C++20 std::chrono timezone/calendar APIs on compilers with support (MSVC only for now) and falls back to vendored `date.h` otherwise.

### Are these changes tested?

Partially tested locally and partially to be tested on CI.

### Are there any user-facing changes?

Yes, Windows users will no longer need to install the IANA tzdb (see [instructions here](https://arrow.apache.org/docs/cpp/build_system.html#runtime-dependencies) and [here](https://arrow.apache.org/docs/python/install.html#tzdata-on-windows)). We possibly have tzdb download set up in CI too and should update it appropriately.
* GitHub Issue: #48593

Authored-by: Rok Mihevc <rok@mihevc.org>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>

2026-03-03 14:19:25 +01:00

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