Chrono: Timezone-aware date and time handling
Chrono aims to provide all functionality needed to do correct operations on dates and times in the proleptic Gregorian calendar:
- The
DateTime
type is timezone-aware by default, with separate timezone-naive types. - Operations that may produce an invalid or ambiguous date and time return
Option
orMappedLocalTime
. - Configurable parsing and formatting with an
strftime
inspired date and time formatting syntax. - The
Local
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 or tzfile
for
full timezone support.
See docs.rs for the API reference.
- 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.
Default features:
alloc
: Enable features that depend on allocation (primarily string formatting).std
: Enables functionality that depends on the standard library. This is a superset ofalloc
and adds interoperation with standard library types and traits.clock
: Enables reading the local timezone (Local
). This is a superset ofnow
.now
: Enables reading the system time (now
).wasmbind
: Interface with the JS Date API for thewasm32
target.
Optional features:
serde
: Enable serialization/deserialization via serde.rkyv
: Deprecated, use therkyv-*
features.rkyv-16
: Enable serialization/deserialization via rkyv, using 16-bit integers for integral*size
types.rkyv-32
: Enable serialization/deserialization via rkyv, using 32-bit integers for integral*size
types.rkyv-64
: Enable serialization/deserialization via rkyv, using 64-bit integers for integral*size
types.rkyv-validation
: Enable rkyv validation support usingbytecheck
.rustc-serialize
: Enable serialization/deserialization via rustc-serialize (deprecated).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.oldtime
: This feature no longer has any effect; it used to offer compatibility with thetime
0.1 crate.
Note: The rkyv{,-16,-32,-64}
features are mutually exclusive.
The Minimum Supported Rust Version (MSRV) is currently Rust 1.61.0.
The MSRV is explicitly tested in CI. It may be bumped in minor releases, but this is not done lightly.
This project is licensed under either of
at your option.