davlee1972 opened a new issue, #45938:
URL: https://github.com/apache/arrow/issues/45938
### Describe the bug, including details regarding any error messages,
version, and platform.
Casting timestamp in milliseconds to date64 in milliseconds is dropping the
time portion..
```
>>> import pyarrow as pa
>>>
>>> current_time = pa.scalar("2025-03-24 01:01:01.111")
>>> current_time.cast("timestamp[ms]")
<pyarrow.TimestampScalar: '2025-03-24T01:01:01.111'>
# time portion is lost..
>>> current_time.cast("timestamp[ms]").cast("date64[ms]")
<pyarrow.Date64Scalar: datetime.date(2025, 3, 24)>
>>>
current_time.cast("timestamp[ms]").cast("date64[ms]").cast("timestamp[ms]")
<pyarrow.TimestampScalar: '2025-03-24T00:00:00.000'>
```
### Component(s)
C++, Python
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