rustime

Rustime is a hypothetical open-source library designed for the Rust programming language to provide comprehensive time representation, manipulation, and scheduling utilities. The project is intended to offer precise time measurements, robust formatting and parsing, time zone support, and integration with asynchronous runtimes, while prioritizing safety, minimal allocations, and predictable performance.

Core concepts and types in Rustime include DateTime and NaiveDateTime to represent calendar dates and times, Duration to express intervals, and TimeZone to handle offsets and regional rules. Instant is used for monotonic time measurements. The design emphasizes explicitness and avoids hidden costs in time arithmetic.

Key features include ISO 8601 and RFC 3339 parsing, flexible formatting options, time-zone aware and naive variants, arithmetic operators for adding or subtracting durations, and scheduling utilities such as delayed execution and timers. The library aims to be embeddable in both desktop and constrained environments and can operate in no_std mode via feature gates.

Architecture and API design revolve around modular crates with a clear boundary between core time types and extensions for formatting, parsing, and I/O. The API favors trait-based abstractions that enable interoperability with existing Rust crates and asynchronous runtimes such as Tokio and async-std.

History and reception: Rustime emerged from an online community project in the mid-2020s, drawing on established Rust time work while seeking to improve ergonomics and safety. It has been referenced in documentation and tutorials as a reference approach to time handling in Rust, and is distributed under an open-source license.

See also: Chrono (Rust), time crate, date and time concepts in Rust, time formatting and parsing in programming.