fast-iso8601-rs

Rust-backed complete drop-in replacement for the frozen public and behavioral contract of iso8601==2.1.0. It keeps the iso8601 import namespace, call signatures, typing marker, datetime/timezone semantics and exception behavior. The native wheel moves the lexical parse and capture extraction into Rust; a universal pure-Python wheel supports Python 3.7 and platforms without a published native wheel.

import iso8601

value = iso8601.parse_date("2026-08-12T10:30:45.123456Z")
assert value.isoformat() == "2026-08-12T10:30:45.123456+00:00"
assert iso8601.is_iso8601("2026-08")

Install

The project is not published from this repository yet. After a release:

python -m pip install fast-iso8601-rs

Existing code continues to use import iso8601. Python 3.8+ selects a native wheel on supported platforms. Python 3.7 selects the py3-none-any fallback.

Compatibility and verification

The replacement is pinned to upstream 2.1.0, not an open-ended promise about future versions. See UPSTREAM-CONTRACT.md for the frozen surface and COMPATIBILITY.md for executable gates.

cargo fmt --all -- --check
cargo clippy --all-targets --all-features -- -D warnings
cargo test --all-targets
python -m pytest -q tests
PYTHON=python bash scripts/run_upstream_full.sh
python scripts/run_differential.py --oracle-python ORACLE --candidate-python CANDIDATE

Benchmark claims are accepted only for the exact installed wheel identified by filename and SHA256, with raw samples, median and p95 retained. No fixed speedup is claimed before that gate passes.

License

MIT. The frozen upstream notice and Rust dependency notices are retained in THIRD_PARTY_NOTICES.md.

Project links

Data verified by PyPI on Aug 12, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

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Latest release

1 maintainer

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Avatar for lowmiaq from gravatar.com lowmiaq

Credits

Author: fast-iso8601-rs contributors

GitHub Statistics

Data verified by PyPI on Aug 12, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
View SPDX License List

Requires

Python <4, >=3.7

Provides Extra

release test

Tags

iso8601 datetime parser pyo3 rust drop-in-replacement

Classifiers

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