dmitry-chirkov-dremio opened a new issue, #49454:
URL: https://github.com/apache/arrow/issues/49454
### Describe the bug, including details regarding any error messages,
version, and platform.
`castVARCHAR_timestamp_int64` produces negative milliseconds for pre-epoch
timestamps (before 1970-01-01).
**Example:** `0107-10-17 12:20:03.900` → `"0107-10-17 12:20:03.-10"`
**Cause:** `in % MILLIS_IN_SEC` returns negative values for negative
timestamps.
**Fix:** Use `EpochTimePoint::TimeOfDay().subseconds().count()` for correct
millisecond extraction.
**Failing Tests (before fix)**
```
ts = StringToTimestamp("67-5-1 00:00:04") + 920;
out = castVARCHAR_timestamp_int64(context_ptr, ts, 24L, &out_len);
EXPECT_EQ(std::string(out, out_len), "0067-05-01 00:00:04.920");
// Actual: "0067-05-01 00:00:04.-80"
```
### Component(s)
C++, Gandiva
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