BurntSushi/jiff

Health v2 · maintenance only

Adoption not part of the score

2898 stars · 116 forks observed · 2026-08-28

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

Jiff is a high-level datetime library for Rust offering date, time, timestamp, and timezone-aware primitives with DST-safe arithmetic, rounding, and lossless formatting/parsing. It integrates seamlessly with the IANA Time Zone Database, supports RFC 3339/2822 and ISO 8601 formats, and draws heavy inspiration from the TC39 Temporal proposal.

Use cases

• parse and format RFC 3339 timestamps in Rust
• do timezone-aware date arithmetic that handles DST correctly
• convert datetimes between IANA time zones
• parse dates with strftime/strptime-style formats
• round datetimes to a given unit
• serialize and deserialize zone-aware datetimes with Serde

When to choose

• you need correct, hard-to-misuse datetime handling in Rust including DST transitions
• you want automatic integration with the system tzdb without manual configuration
• you need lossless round-tripping of zone-aware datetimes
• you want a modern API modeled on the Temporal design instead of chrono or time

When to avoid

• you need astronomy-oriented or high-precision scientific timekeeping like hifitime provides
• you are locked into an existing codebase built around chrono or time and don't want a migration
• you need calendar systems beyond what Jiff supports, such as non-Gregorian calendars

Facets

library · maturity stable

date-time parser serialization cross-platform developer-tools rust cross-platform datetime timezone calendar dst rfc3339 iso8601 tzdb temporal-inspired duration-arithmetic rust-crate localization

Member repositories

For agents

markdown · JSON · MCP: product_card(name="BurntSushi/jiff")