[Kayvan-Zahiri]

Proposed Changes

Avoid floating-point division when reducing datetime/timedelta nanoseconds to microseconds, milliseconds, or seconds in Point line protocol. Near an interval boundary, float rounding can move the timestamp into the next interval before the final integer conversion.

For example, with the documented PandasDateTimeHelper, a timestamp of 1700000000000000999 ns is serialized at microsecond precision as 1700000000000001, although truncation gives 1700000000000000.

Use exact integer arithmetic, preserving the existing truncation-toward-zero behavior for negative timestamps. Nanosecond precision and integer timestamp inputs retain their existing paths.

Validation

• Public Point.time(...).to_line_protocol() tests cover positive and negative pandas timestamps just before and exactly on microsecond/millisecond/second boundaries, plus unchanged nanosecond precision.
• Before: 6 regressions fail; 8 controls pass.
• After: 65 pass across the new tests, test_point.py, test_DateHelper.py, and test_PandasDateTimeHelper.py.
• Changed-file Flake8, compileall, and git diff --check pass.
• Full flake8 setup.py influxdb_client/ reports two existing E721 diagnostics in _async/api_client.py:270 and _sync/api_client.py:287. Unchanged point.py produces byte-for-byte identical output. No diagnostics are suppressed.
• No live InfluxDB instance or credentials used; full server integration suite and Python-version matrix not run locally.

Checklist

• CHANGELOG.md updated
• Regression tests added
• Targeted point/date tests pass
• Full pytest tests integration suite (requires InfluxDB)
• Conventional commit message
• InfluxData CLA submitted with explicit contributor authorization; the official form confirmed "Your response has been recorded." Maintainer-side verification may still be pending.

AI assistance: OpenAI Codex assisted with reproduction, patch, tests, and this description.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.47%. Comparing base (ef60f89) to head (c403555).

Files with missing lines	Patch %	Lines
influxdb_client/client/write/point.py	80.00%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #724      +/-   ##
==========================================
- Coverage   90.49%   90.47%   -0.03%     
==========================================
  Files          40       40              
  Lines        3568     3570       +2     
==========================================
+ Hits         3229     3230       +1     
- Misses        339      340       +1     

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