Crate icu_calendar

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Expand description

Types for dealing with dates, times, and custom calendars.

This module is published as its own crate (icu_calendar) and as part of the icu crate. See the latter for more details on the ICU4X project. The types module has a lot of common types for dealing with dates and times.

Calendar is a trait that allows one to define custom calendars, and Date can represent dates for arbitrary calendars.

The Iso and Gregorian types are implementations for the ISO and Gregorian calendars respectively. Further calendars can be found in the cal module.

Most interaction with this crate will be done via the Date and DateTime types.

Some of the algorithms implemented here are based on Dershowitz, Nachum, and Edward M. Reingold. Calendrical calculations. Cambridge University Press, 2008. with associated Lisp code found at https://github.com/EdReingold/calendar-code2.

§Examples

Examples of date manipulation using Date object. Date objects are useful for working with dates, encompassing information about the day, month, year, as well as the calendar type.

use icu::calendar::{types::IsoWeekday, Date};

// Creating ISO date: 1992-09-02.
let mut date_iso = Date::try_new_iso(1992, 9, 2)
    .expect("Failed to initialize ISO Date instance.");

assert_eq!(date_iso.day_of_week(), IsoWeekday::Wednesday);
assert_eq!(date_iso.year().era_year_or_extended(), 1992);
assert_eq!(date_iso.month().ordinal, 9);
assert_eq!(date_iso.day_of_month().0, 2);

// Answering questions about days in month and year.
assert_eq!(date_iso.days_in_year(), 366);
assert_eq!(date_iso.days_in_month(), 30);

Example of converting an ISO date across Indian and Buddhist calendars.

use icu::calendar::cal::{Buddhist, Indian};
use icu::calendar::Date;

// Creating ISO date: 1992-09-02.
let mut date_iso = Date::try_new_iso(1992, 9, 2)
    .expect("Failed to initialize ISO Date instance.");

assert_eq!(date_iso.year().era_year_or_extended(), 1992);
assert_eq!(date_iso.month().ordinal, 9);
assert_eq!(date_iso.day_of_month().0, 2);

// Conversion into Indian calendar: 1914-08-02.
let date_indian = date_iso.to_calendar(Indian);
assert_eq!(date_indian.year().era_year_or_extended(), 1914);
assert_eq!(date_indian.month().ordinal, 6);
assert_eq!(date_indian.day_of_month().0, 11);

// Conversion into Buddhist calendar: 2535-09-02.
let date_buddhist = date_iso.to_calendar(Buddhist);
assert_eq!(date_buddhist.year().era_year_or_extended(), 2535);
assert_eq!(date_buddhist.month().ordinal, 9);
assert_eq!(date_buddhist.day_of_month().0, 2);

Example using DateTime object. Similar to Date objects, DateTime objects contain an accessible Date object containing information about the day, month, year, and calendar type. Additionally, DateTime objects contain an accessible Time object, including granularity of hour, minute, second, and nanosecond.

use icu::calendar::{types::IsoWeekday, DateTime, Time};

// Creating ISO date: 1992-09-02 8:59
let mut datetime_iso = DateTime::try_new_iso(1992, 9, 2, 8, 59, 0)
    .expect("Failed to initialize ISO DateTime instance.");

assert_eq!(datetime_iso.date.day_of_week(), IsoWeekday::Wednesday);
assert_eq!(datetime_iso.date.year().era_year_or_extended(), 1992);
assert_eq!(datetime_iso.date.month().ordinal, 9);
assert_eq!(datetime_iso.date.day_of_month().0, 2);
assert_eq!(datetime_iso.time.hour.number(), 8);
assert_eq!(datetime_iso.time.minute.number(), 59);
assert_eq!(datetime_iso.time.second.number(), 0);
assert_eq!(datetime_iso.time.nanosecond.number(), 0);

Re-exports§

Modules§

  • any_calendar
    Module for working with multiple calendars at once
  • cal
    Types for individual calendars
  • provider
    🚧 [Unstable] Data provider struct definitions for this ICU4X component.
  • types
    This module contains various types used by icu_calendar and icu::datetime
  • week
    Functions for week-of-month and week-of-year arithmetic.

Structs§

  • Date
    A date for a given calendar.
  • DateTime
    A date+time for a given calendar.
  • RangeError
    An argument is out of range for its domain.
  • Ref
    This exists as a wrapper around &'a T so that Date<&'a C> is possible for calendar C.

Enums§

  • DateError
    Error type for date creation.
  • ParseError
    An error returned from parsing an IXDTF string to an icu_calendar type.

Traits§