ariebovenberg/whenever

Health v2 · maintenance only

Adoption not part of the score

2398 stars · 37 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Whenever is a Python library providing type-safe datetime and timezone handling that prevents naive/aware mixing at the type level and correctly handles DST in all arithmetic. It offers both a fast Rust extension and a pure Python implementation.

Use cases

• parse and format RFC 3339 timestamps safely
• avoid mixing naive and aware datetimes in Python
• handle daylight saving time correctly in datetime arithmetic
• convert datetimes between timezones and UTC offsets
• get faster datetime operations than the standard library
• add strict type checking for datetime usage with mypy

When to choose

• you need DST-correct datetime arithmetic in Python
• you want type errors instead of runtime bugs for naive/aware mixing
• performance matters and you want faster-than-stdlib datetimes
• you want a choice between Rust-backed and pure Python implementations

When to avoid

• you need a drop-in replacement for datetime.datetime
• your project cannot add third-party dependencies
• you need date parsing beyond datetime scope like natural language dates

Facets

library · maturity active

date-time type-system serialization developer-tools programming-languages python rust cross-platform datetime timezone dst type-safety mypy rfc3339 utc pure-python algorithms

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