parthchandra commented on PR #6456:
URL: 
https://github.com/apache/datafusion-comet/pull/6456#issuecomment-5919288835

   The `iceberg_div_floor` math faithfully reproduces iceberg-java's 
`DateTimeUtil.convertMicros` pre-epoch rounding (the `+1` correction failing to 
carry at microsecond-of-second 999999), all four transforms and both timestamp 
types are covered, and there's no overflow risk. One check:
   
   - **`docs/source/contributor-guide/iceberg-writes.md:223`** — please 
double-check this accepted-divergence paragraph (the #6426 pre-1970 floor note) 
doesn't still describe pre-epoch rounding as an open gap now that this PR fixes 
it. If it does, it should be updated or removed.
   


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