Struct JapaneseExtended 

pub struct JapaneseExtended(/* private fields */);

The Japanese Calendar (with historical eras)

The Japanese Calendar is a variant of the Gregorian calendar created by the Japanese government. It is identical to the Gregorian calendar except that is uses Japanese eras instead of the Common Era.

This implementation extends proleptically for dates before the calendar’s creation in 6 Meiji (1873 CE). This implementation uses approximations of earlier Japanese eras proleptically and uses the Gregorian eras for even earlier dates that don’t have an approximate Japanese era.

For a variant whose Japanese eras start with Meiji, check out Japanese.

This corresponds to the "japanext" CLDR calendar.

Era codes

This calendar supports a large number of era codes. It supports the five eras since its introduction (meiji, taisho, showa, heisei, reiwa). Proleptic eras are represented with their names converted to lowercase ASCII and followed by their start year. E.g. the Ten’ō era (781 - 782 CE) has the code teno-781. The Gregorian bce (alias bc), and ce (alias ad) are used for dates before the first known era era.

These eras are loaded from data, requiring a data provider capable of providing CalendarJapaneseExtendedV1 data.

Implementations

impl JapaneseExtended

pub const fn new() -> Self

Creates a new Japanese from using all eras (including pre-meiji) from compiled data.

✨ Enabled with the compiled_data Cargo feature.

📚 Help choosing a constructor

pub fn try_new_with_buffer_provider( provider: &(impl BufferProvider + ?Sized), ) -> Result<Self, DataError>

A version of [Self :: new] that uses custom data provided by a BufferProvider.

✨ Enabled with the serde feature.

📚 Help choosing a constructor

pub fn try_new_unstable<D: DataProvider<CalendarJapaneseExtendedV1> + ?Sized>( provider: &D, ) -> Result<Self, DataError>

A version of Self::new that uses custom data provided by a DataProvider.

📚 Help choosing a constructor

⚠️ The bounds on provider may change over time, including in SemVer minor releases.

Trait Implementations

impl Calendar for JapaneseExtended

type DateInner = JapaneseExtendedDateInner

The internal type used to represent dates

type Year = EraYear

The type of YearInfo returned by the date

type DifferenceError = Infallible

The type of error returned by until

fn from_codes( &self, era: Option<&str>, year: i32, month_code: MonthCode, day: u8, ) -> Result<Self::DateInner, DateError>

Construct a date from era/month codes and fields

fn from_rata_die(&self, rd: RataDie) -> Self::DateInner

Construct the date from a RataDie

fn to_rata_die(&self, date: &Self::DateInner) -> RataDie

Obtain a RataDie from this date

fn has_cheap_iso_conversion(&self) -> bool

Whether from_iso/to_iso is more efficient than from_rata_die/to_rata_die.

fn from_iso(&self, iso: IsoDateInner) -> Self::DateInner

Construct the date from an ISO date.

fn to_iso(&self, date: &Self::DateInner) -> IsoDateInner

Obtain an ISO date from this date.

fn months_in_year(&self, date: &Self::DateInner) -> u8

Count the number of months in a given year, specified by providing a date from that year

fn days_in_year(&self, date: &Self::DateInner) -> u16

Count the number of days in a given year, specified by providing a date from that year

fn days_in_month(&self, date: &Self::DateInner) -> u8

Count the number of days in a given month, specified by providing a date from that year/month

fn year_info(&self, date: &Self::DateInner) -> Self::Year

Information about the year

fn is_in_leap_year(&self, date: &Self::DateInner) -> bool

Calculate if a date is in a leap year

fn month(&self, date: &Self::DateInner) -> MonthInfo

The calendar-specific month represented by date

fn day_of_month(&self, date: &Self::DateInner) -> DayOfMonth

The calendar-specific day-of-month represented by date

fn day_of_year(&self, date: &Self::DateInner) -> DayOfYear

Information of the day of the year

fn debug_name(&self) -> &'static str

Obtain a name for the calendar for debug printing

fn calendar_algorithm(&self) -> Option<CalendarAlgorithm>

Returns the CalendarAlgorithm that is required to match when parsing into this calendar.

fn extended_year(&self, date: &Self::DateInner) -> i32

The extended year.

impl Clone for JapaneseExtended

fn clone(&self) -> JapaneseExtended

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for JapaneseExtended

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for JapaneseExtended

fn default() -> JapaneseExtended

Returns the “default value” for a type.

impl From<JapaneseExtended> for AnyCalendar

fn from(value: JapaneseExtended) -> AnyCalendar

Converts to this type from the input type.

impl IntoAnyCalendar for JapaneseExtended

fn to_any(self) -> AnyCalendar

Convert this calendar into an AnyCalendar, moving it

fn kind(&self) -> AnyCalendarKind

The AnyCalendarKind enum variant associated with this calendar

fn from_any(any: AnyCalendar) -> Result<Self, AnyCalendar>

Move an AnyCalendar into a Self, or returning it as an error if the types do not match.

fn from_any_ref(any: &AnyCalendar) -> Option<&Self>

Convert an AnyCalendar reference into a Self reference.

fn date_to_any(&self, d: &Self::DateInner) -> AnyDateInner

Convert a date for this calendar into an AnyDateInner