What is python-dateutil-rs?

It's a Rust-powered drop-in replacement for python-dateutil, offering 5x-94x speedups on parsing, RRULEs, and more via PyO3.

How do I install python-dateutil-rs?

`pip install python-dateutil-rs`. Swap your import, rerun tests.

Is python-dateutil-rs fully compatible?

Yes — passes all original tests, identical API and behavior.

📦 Open Source

Rust's Naive Port of python-dateutil Delivers 94x Speedups — No Code Changes Needed

300 million monthly downloads can't be wrong: python-dateutil powers Python's date handling. Now, its Rust twin slashes parse times by 94x without touching your code.

theAIcatchup Apr 08, 2026 4 min read

Benchmark graph: python-dateutil-rs 94x faster than original Python

⚡ Key Takeaways

Naive Rust port yields 94x parsing speedups with zero app changes. 𝕏
PyO3 + maturin enables perfect drop-in modules for pure-Python libs. 𝕏
Blueprint for accelerating Python's unoptimized core dependencies. 𝕏

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theAIcatchup

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#dateutil #performance #performance optimization #pyo3 #python #python-dateutil-rs #rust #rust python

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Originally reported by dev.to

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