canassa opened a new issue, #49351:
URL: https://github.com/apache/arrow/issues/49351
### Describe the bug, including details regarding any error messages,
version, and platform.
The vendored Howard Hinnant date library hardcodes `/usr/share/zoneinfo` as
the timezone database path in `discover_tz_dir()`
(`cpp/src/arrow/vendored/datetime/tz.cpp`). It does not check the `TZDIR`
environment variable, which is the POSIX standard mechanism for overriding this
path.
This causes timezone operations to fail on non FHS Linux distributions such
as NixOS, where `zoneinfo` resides under a non standard path like
`/nix/store/.../share/zoneinfo`.
The upstream library also lacks `TZDIR` support
### Reproduction
On NixOS without a `TZDIR` patch:
```python
import pyarrow as pa
arr = pa.array([1], type=pa.timestamp("s", tz="America/New_York"))
# Fails: discover_tz_dir failed to find zoneinfo
```
### Expected Behavior
Arrow should check `TZDIR` before falling back to hardcoded paths,
consistent with POSIX conventions and tools such as glibc, busybox, and
Python's `zoneinfo` module.
### Component(s)
C++
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