Jiff 1.0 released: Rust datetime library already powering uv, Cargo and more
charliermarsh · x · 2026-11-16
Andrew Gallant announces Jiff 1.0, the Rust datetime library that puts time-zone handling front and center, and commits to API stability indefinitely.
- Automatically handles daylight-saving pitfalls by design
- Already in production across uv, Cargo, Starship, fd, Nushell, Jujutsu, uutils/coreutils, and underpins a Temporal implementation in AWS LLRT
- The post is a full API tour: parsing/formatting (strptime, strftime, friendly durations), ICU4X locale-sensitive formatting, date arithmetic and rounding, span manipulation, alternative calendars
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