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Round pre-epoch timestamps consistently to microseconds - #914
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Signed-off-by: hutiefang76 <137664623+hutiefang76@users.noreply.github.com>
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Thanks for the PR! Looks good to me.
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This is a backport of the PR #914 to `v2.0-cyanoptera` branch.
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Converting a timestamp before 1970 through ChronoUnit.MICROS truncates the epoch interval toward zero: 1969-12-31 23:59:59.987654321 becomes .987655. The fix derives microseconds from the UTC epoch second and fractional nanoseconds, making sub-microsecond truncation consistent on both sides of the epoch. Constructors and JDBC binding share the conversion; existing pre-epoch offset-time coverage is corrected accordingly.
Validation on macOS arm64: compiled all Java production and test sources against the existing JNI artifact; ran TestTimestamp (26 tests). New regressions fail against the original Java implementation and pass with this patch. The full official clang-format 11 check passes. Full native and multi-platform CI remain to be run.
AI assistance was used for implementation and source review.