singhpratech commented on issue #36110:
URL: https://github.com/apache/arrow/issues/36110#issuecomment-5579337248
Still present in pyarrow 25.0.1 on macOS 26.6 (arm64), and it is not only a
slim-file matter: the
system zoneinfo here is a fat TZif version 2 file (America/New_York, 3552
bytes, transitions
tabulated through 2037, footer `EST5EDT,M3.2.0,M11.1.0`), and
`assume_timezone` gives the winter
offset for every July instant from 2038 on while `zoneinfo` and `zdump`
apply the footer rule:
```python
import datetime as dt, zoneinfo, pyarrow as pa, pyarrow.compute as pc
tz = zoneinfo.ZoneInfo("America/New_York")
for year in (2037, 2038, 2050):
naive = dt.datetime(year, 7, 15, 12, 0)
utc = pc.assume_timezone(pa.array([naive], pa.timestamp("s")),
"America/New_York").cast(pa.timestamp("s", "UTC")).to_pylist()[0]
print(year, int((naive - utc.replace(tzinfo=None)).total_seconds()),
int(naive.replace(tzinfo=tz).utcoffset().total_seconds()))
# 2037 -14400 -14400
# 2038 -18000 -14400
# 2050 -18000 -14400
```
(I filed #51226 for this before finding this issue; it is closed as a
duplicate.)
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