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Add missing features documentation #1260

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Sep 6, 2023
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Add missing features documentation #1260

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64 changes: 28 additions & 36 deletions src/lib.rs
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Original file line number Diff line number Diff line change
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//! # Chrono: Date and Time for Rust
//!
//! It aims to be a feature-complete superset of
//! the [time](https://github.com/rust-lang-deprecated/time) library.
//! In particular,
//!
//! * Chrono strictly adheres to ISO 8601.
//! * Chrono is timezone-aware by default, with separate timezone-naive types.
//! * Chrono is space-optimal and (while not being the primary goal) reasonably efficient.
//!
//! There were several previous attempts to bring a good date and time library to Rust,
//! which Chrono builds upon and should acknowledge:
//!
//! * [Initial research on
//! the wiki](https://github.com/rust-lang/rust-wiki-backup/blob/master/Lib-datetime.md)
//! * Dietrich Epp's [datetime-rs](https://github.com/depp/datetime-rs)
//! * Luis de Bethencourt's [rust-datetime](https://github.com/luisbg/rust-datetime)

//! Chrono aims to provide all functionality needed to do correct operations on dates and times in the
//! [proleptic Gregorian calendar](https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar):
//!
//! * The [`DateTime`](https://docs.rs/chrono/latest/chrono/struct.DateTime.html) type is timezone-aware
//! by default, with separate timezone-naive types.
//! * Operations that may produce an invalid or ambiguous date and time return `Option` or
//! [`LocalResult`](https://docs.rs/chrono/latest/chrono/offset/enum.LocalResult.html).
//! * Configurable parsing and formatting with a `strftime` inspired date and time formatting syntax.
//! * The [`Local`](https://docs.rs/chrono/latest/chrono/offset/struct.Local.html) timezone works with
//! the current timezone of the OS.
//! * Types and operations are implemented to be reasonably efficient.
//!
//! Timezone data is not shipped with chrono by default to limit binary sizes. Use the companion crate
//! [Chrono-TZ](https://crates.io/crates/chrono-tz) or [`tzfile`](https://crates.io/crates/tzfile) for
//! full timezone support.
//!
//! ### Features
//!
Expand All @@ -29,10 +30,13 @@
//! and traits.
//! - `clock`: Enables reading the system time (`now`) that depends on the standard library for
//! UNIX-like operating systems and the Windows API (`winapi`) for Windows.
//! - `wasmbind`: Interface with the JS Date API for the `wasm32` target.
//!
//! Optional features:
//!
//! - [`serde`][]: Enable serialization/deserialization via serde.
//! - `rkyv`: Enable serialization/deserialization via rkyv.
//! - `arbitrary`: construct arbitrary instances of a type with the Arbitrary crate.
//! - `unstable-locales`: Enable localization. This adds various methods with a
//! `_localized` suffix. The implementation and API may change or even be
//! removed in a patch release. Feedback welcome.
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//!
//! ## Limitations
//!
//! Only proleptic Gregorian calendar (i.e. extended to support older dates) is supported.
//! Be very careful if you really have to deal with pre-20C dates, they can be in Julian or others.
//!
//! Date types are limited in about +/- 262,000 years from the common epoch.
//! Time types are limited in the nanosecond accuracy.
//!
//! [Leap seconds are supported in the representation but
//! Chrono doesn't try to make use of them](./naive/struct.NaiveTime.html#leap-second-handling).
//! (The main reason is that leap seconds are not really predictable.)
//! Almost *every* operation over the possible leap seconds will ignore them.
//! Consider using `NaiveDateTime` with the implicit TAI (International Atomic Time) scale
//! if you want.
//! Only the proleptic Gregorian calendar (i.e. extended to support older dates) is supported.
//! Date types are limited to about +/- 262,000 years from the common epoch.
//! Time types are limited to nanosecond accuracy.
//! Leap seconds can be represented, but Chrono does not fully support them.
//! See [Leap Second Handling](https://docs.rs/chrono/latest/chrono/naive/struct.NaiveTime.html#leap-second-handling).
//!
//! Chrono inherently does not support an inaccurate or partial date and time representation.
//! Any operation that can be ambiguous will return `None` in such cases.
//! For example, "a month later" of 2014-01-30 is not well-defined
//! and consequently `Utc.ymd_opt(2014, 1, 30).unwrap().with_month(2)` returns `None`.
//! ## Rust version requirements
//!
//! Non ISO week handling is not yet supported.
//! For now you can use the [chrono_ext](https://crates.io/crates/chrono_ext)
//! crate ([sources](https://github.com/bcourtine/chrono-ext/)).
//! The Minimum Supported Rust Version (MSRV) is currently **Rust 1.57.0**.
//!
//! Advanced time zone handling is not yet supported.
//! For now you can try the [Chrono-tz](https://github.com/chronotope/chrono-tz/) crate instead.
//! The MSRV is explicitly tested in CI. It may be bumped in minor releases, but this is not done
//! lightly.

#![doc(html_root_url = "https://docs.rs/chrono/latest/", test(attr(deny(warnings))))]
#![cfg_attr(feature = "bench", feature(test))] // lib stability features as per RFC #507
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