Crate time

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§Feature flags

This crate exposes a number of features. These can be enabled or disabled as shown in Cargo’s documentation. Features are disabled by default unless otherwise noted.

Reliance on a given feature is always indicated alongside the item definition.

  • std (enabled by default, implicitly enables alloc)

    This enables a number of features that depend on the standard library.

  • alloc (enabled by default via std)

    Enables a number of features that require the ability to dynamically allocate memory.

  • macros

    Enables macros that provide compile-time verification of values and intuitive syntax.

  • formatting (implicitly enables std)

    Enables formatting of most structs.

  • parsing

    Enables parsing of most structs.

  • local-offset (implicitly enables std)

    This feature enables a number of methods that allow obtaining the system’s UTC offset.

  • large-dates

    By default, only years within the ±9999 range (inclusive) are supported. If you need support for years outside this range, consider enabling this feature; the supported range will be increased to ±999,999.

    Note that enabling this feature has some costs, as it means forgoing some optimizations. Ambiguities may be introduced when parsing that would not otherwise exist.

  • serde

    Enables serde support for all types except Instant.

  • serde-human-readable (implicitly enables serde, formatting, and parsing)

    Allows serde representations to use a human-readable format. This is determined by the serializer, not the user. If this feature is not enabled or if the serializer requests a non-human-readable format, a format optimized for binary representation will be used.

    Libraries should never enable this feature, as the decision of what format to use should be up to the user.

  • serde-well-known (implicitly enables serde-human-readable)

    This feature flag is deprecated and will be removed in a future breaking release. Use the serde-human-readable feature instead.

    Enables support for serializing and deserializing well-known formats using serde’s #[with] attribute.

  • rand

    Enables rand support for all types.

  • quickcheck (implicitly enables alloc)

    Enables quickcheck support for all types except Instant.

  • wasm-bindgen

    Enables wasm-bindgen support for converting JavaScript dates, as well as obtaining the UTC offset from JavaScript.


  • pub use crate::error::Error;


  • Various error types returned by methods in the time crate.
  • Extension traits.
  • Utility functions.



Type Aliases§