jorisvandenbossche commented on pull request #11818:
URL: https://github.com/apache/arrow/pull/11818#issuecomment-1000238934
I suppose a simpler example is actually also rounding to a multiple of hours
in a normal timezone. For example for me, the current UTC offset is +1, so
rounding to two hours will give a different result when doing it in UTC:
```python
>>> ts = pd.Timestamp("2021-12-23 12:17:00", tz="Europe/Brussels")
>>> ts
Timestamp('2021-12-23 12:17:00+0100', tz='Europe/Brussels')
# with pandas I get 12:00
>>> ts.round("2H")
Timestamp('2021-12-23 12:00:00+0100', tz='Europe/Brussels')
>>> arr = pa.array([ts])
>>> pc.round_temporal(arr, unit="hour", multiple=2)
<pyarrow.lib.TimestampArray object at 0x7f743c74cc40>
[
2021-12-23 12:00:00.000000
]
# but with arrow I get 12:00 in UTC, so 13:00 in local time
>>> pc.round_temporal(arr, unit="hour", multiple=2)[0]
<pyarrow.TimestampScalar: datetime.datetime(2021, 12, 23, 13, 0,
tzinfo=<DstTzInfo 'Europe/Brussels' CET+1:00:00 STD>)>
```
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