chrono

Module format

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Expand description

Formatting (and parsing) utilities for date and time.

This module provides the common types and routines to implement, for example, DateTime::format or DateTime::parse_from_str methods. For most cases you should use these high-level interfaces.

Internally the formatting and parsing shares the same abstract formatting items, which are just an Iterator of the Item type. They are generated from more readable format strings; currently Chrono supports a built-in syntax closely resembling C’s strftime format. The available options can be found here.

§Example

use chrono::{NaiveDateTime, TimeZone, Utc};

let date_time = Utc.with_ymd_and_hms(2020, 11, 10, 0, 1, 32).unwrap();

let formatted = format!("{}", date_time.format("%Y-%m-%d %H:%M:%S"));
assert_eq!(formatted, "2020-11-10 00:01:32");

let parsed = NaiveDateTime::parse_from_str(&formatted, "%Y-%m-%d %H:%M:%S")?.and_utc();
assert_eq!(parsed, date_time);

Re-exports§

Modules§

  • strftime
    strftime/strptime-inspired date and time formatting syntax.

Structs§

  • DelayedFormatalloc
    A temporary object which can be used as an argument to format! or others. This is normally constructed via format methods of each date and time type.
  • InternalFixed
    An opaque type representing fixed-format item types for internal uses only.
  • InternalNumeric
    An opaque type representing numeric item types for internal uses only.
  • OffsetFormat
    Type for specifying the format of UTC offsets.
  • ParseError
    An error from the parse function.
  • Parsed
    A type to hold parsed fields of date and time that can check all fields are consistent.

Enums§

  • Colons
    The separator between hours and minutes in an offset.
  • Fixed
    Fixed-format item types.
  • Item
    A single formatting item. This is used for both formatting and parsing.
  • Numeric
    Numeric item types. They have associated formatting width (FW) and parsing width (PW).
  • OffsetPrecision
    The precision of an offset from UTC formatting item.
  • Pad
    Padding characters for numeric items.
  • ParseErrorKind
    The category of parse error
  • SecondsFormat
    Specific formatting options for seconds. This may be extended in the future, so exhaustive matching in external code is not recommended.

Functions§

  • formatDeprecatedalloc
    Tries to format given arguments with given formatting items. Internally used by DelayedFormat.
  • format_itemDeprecatedalloc
    Formats single formatting item
  • parse
    Tries to parse given string into parsed with given formatting items. Returns Ok when the entire string has been parsed (otherwise parsed should not be used). There should be no trailing string after parsing; use a stray Item::Space to trim whitespaces.
  • parse_and_remainder
    Tries to parse given string into parsed with given formatting items. Returns Ok with a slice of the unparsed remainder.

Type Aliases§