GeezerVison

Require OSError with EINVAL for representable timestamps rejected by the Windows C runtime, while preserving OverflowError for float(2**63). This initial regression-only commit intentionally exposes the current Windows error mapping before the implementation follows.

AI assistance covered source comparison, regression design, and automated Linux baseline/reference controls. Native Windows results are pending. No human validation is claimed.

Assisted-by: Codex:model-version-unavailable

The first hosted regression run failed on CPython 3.14.7 as well as RustPython because a presumed-invalid CRT timestamp succeeded. Add bounded diagnostics before the unchanged assertions to capture full version/build metadata and every conversion result, including negative half-day controls. No implementation or canonical test changes are included.

The existing time snippet still passes the repository pytest runner on Linux CPython 3.14.7 and the current RustPython baseline. Native diagnostic results remain pending.

Assisted-by: Codex:model-version-unavailable

Hosted Windows diagnostics show that CPython 3.14.7 and RustPython both accept gmtime(-1) and gmtime(-43200), while -86400 is rejected by all three converters. Correct only the newly added shared negative test value. CPython raises OSError(errno 22) for every selected rejected value, while the RustPython baseline raises OverflowError. Canonical tests and the recorded diagnostics remain unchanged.

The existing snippet passes both Linux reference and baseline controls. Assisted source investigation and automated verification used no manual validation.

Assisted-by: Codex:model-version-unavailable

Return CRT errno failures from the Windows calendar helpers and translate them to Python OSError. Adapt the datetime caller while retaining its Unix behavior. Use an exclusive signed float upper bound so float(2**63) still raises OverflowError before reaching the CRT.

Keep Windows negative-time FILETIME fallback and time64 ABI changes outside this Python 3.14 extraction. Existing datetime local-error coverage is retained and a UTC error control is added for the observed rejected timestamp -86400.

Hosted native diagnostics prove CPython 3.14.7 raises OSError(errno 22) where the baseline raises OverflowError. Windows-GNU host_env check and warnings-denied Clippy pass. Selected canonical datetime and complete time/datetime snippet Linux controls pass, with six existing baseline canonical skips. Fixed native Windows verification remains pending CI.

AI assistance covered source comparison, implementation, regression design, and automated verification. No manual validation is claimed.

Assisted-by: Codex:model-version-unavailable

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