jdk.time.chrono.IsoChronology — clojure-interop/java.time 1.0.5

The ISO calendar system.

This chronology defines the rules of the ISO calendar system. This calendar system is based on the ISO-8601 standard, which is the de facto world calendar.

The fields are defined as follows:

era - There are two eras, 'Current Era' (CE) and 'Before Current Era' (BCE). year-of-era - The year-of-era is the same as the proleptic-year for the current CE era. For the BCE era before the ISO epoch the year increases from 1 upwards as time goes backwards. proleptic-year - The proleptic year is the same as the year-of-era for the current era. For the previous era, years have zero, then negative values. month-of-year - There are 12 months in an ISO year, numbered from 1 to 12. day-of-month - There are between 28 and 31 days in each of the ISO month, numbered from 1 to 31. Months 4, 6, 9 and 11 have 30 days, Months 1, 3, 5, 7, 8, 10 and 12 have 31 days. Month 2 has 28 days, or 29 in a leap year. day-of-year - There are 365 days in a standard ISO year and 366 in a leap year. The days are numbered from 1 to 365 or 1 to 366. leap-year - Leap years occur every 4 years, except where the year is divisble by 100 and not divisble by 400.

*-instance clj

Static Constant.

Singleton instance of the ISO chronology.

type: java.time.chrono.IsoChronology

date clj

(date this temporal)

(date this proleptic-year month day-of-month)

(date this era year-of-era month day-of-month)

Obtains an ISO local date from the era, year-of-era, month-of-year and day-of-month fields.

era - the ISO era, not null - java.time.chrono.Era year-of-era - the ISO year-of-era - int month - the ISO month-of-year - int day-of-month - the ISO day-of-month - int

returns: the ISO local date, not null - java.time.LocalDate

throws: java.time.DateTimeException - if unable to create the date

date-epoch-day clj

(date-epoch-day this epoch-day)

Obtains an ISO local date from the epoch-day.

This is equivalent to LocalDate.ofEpochDay(long).

epoch-day - the epoch day - long

returns: the ISO local date, not null - java.time.LocalDate

throws: java.time.DateTimeException - if unable to create the date

date-now clj

(date-now this)

(date-now this zone)

Obtains the current ISO local date from the system clock in the specified time-zone.

This will query the system clock to obtain the current date. Specifying the time-zone avoids dependence on the default time-zone.

Using this method will prevent the ability to use an alternate clock for testing because the clock is hard-coded.

zone - the zone ID to use, not null - java.time.ZoneId

returns: the current ISO local date using the system clock, not null - java.time.LocalDate

throws: java.time.DateTimeException - if unable to create the date

date-year-day clj

(date-year-day this proleptic-year day-of-year)

(date-year-day this era year-of-era day-of-year)

Obtains an ISO local date from the era, year-of-era and day-of-year fields.

era - the ISO era, not null - java.time.chrono.Era year-of-era - the ISO year-of-era - int day-of-year - the ISO day-of-year - int

returns: the ISO local date, not null - java.time.LocalDate

throws: java.time.DateTimeException - if unable to create the date

era-of clj

(era-of this era-value)

Description copied from interface: Chronology

era-value - the era value - int

returns: the calendar system era, not null - java.time.chrono.IsoEra

eras clj

(eras this)

Description copied from interface: Chronology

returns: the list of eras for the chronology, may be immutable, not null - java.util.List<java.time.chrono.Era>

get-calendar-type clj

(get-calendar-type this)

Gets the calendar type of the underlying calendar system - 'iso8601'.

The calendar type is an identifier defined by the Unicode Locale Data Markup Language (LDML) specification. It can be used to lookup the Chronology using Chronology.of(String). It can also be used as part of a locale, accessible via Locale.getUnicodeLocaleType(String) with the key 'ca'.

returns: the calendar system type - 'iso8601' - java.lang.String

get-id clj

(get-id this)

Gets the ID of the chronology - 'ISO'.

The ID uniquely identifies the Chronology. It can be used to lookup the Chronology using Chronology.of(String).

returns: the chronology ID - 'ISO' - java.lang.String

leap-year? clj

(leap-year? this proleptic-year)

Checks if the year is a leap year, according to the ISO proleptic calendar system rules.

This method applies the current rules for leap years across the whole time-line. In general, a year is a leap year if it is divisible by four without remainder. However, years divisible by 100, are not leap years, with the exception of years divisible by 400 which are.

For example, 1904 is a leap year it is divisible by 4. 1900 was not a leap year as it is divisible by 100, however 2000 was a leap year as it is divisible by 400.

The calculation is proleptic - applying the same rules into the far future and far past. This is historically inaccurate, but is correct for the ISO-8601 standard.

proleptic-year - the ISO proleptic year to check - long

returns: true if the year is leap, false otherwise - boolean

local-date-time clj

(local-date-time this temporal)

Obtains an ISO local date-time from another date-time object.

This is equivalent to LocalDateTime.from(TemporalAccessor).

temporal - the date-time object to convert, not null - java.time.temporal.TemporalAccessor

returns: the ISO local date-time, not null - java.time.LocalDateTime

throws: java.time.DateTimeException - if unable to create the date-time

period clj

(period this years months days)

Obtains a period for this chronology based on years, months and days.

This returns a period tied to the ISO chronology using the specified years, months and days. See Period for further details.

years - the number of years, may be negative - int months - the number of years, may be negative - int days - the number of years, may be negative - int

returns: the period in terms of this chronology, not null - java.time.Period

proleptic-year clj

(proleptic-year this era year-of-era)

Description copied from interface: Chronology

era - the era of the correct type for the chronology, not null - java.time.chrono.Era year-of-era - the chronology year-of-era - int

returns: the proleptic-year - int

range clj

(range this field)

Description copied from interface: Chronology

field - the field to get the range for, not null - java.time.temporal.ChronoField

returns: the range of valid values for the field, not null - java.time.temporal.ValueRange

resolve-date clj

(resolve-date this field-values resolver-style)

Resolves parsed ChronoField values into a date during parsing.

Most TemporalField implementations are resolved using the resolve method on the field. By contrast, the ChronoField class defines fields that only have meaning relative to the chronology. As such, ChronoField date fields are resolved here in the context of a specific chronology.

ChronoField instances on the ISO calendar system are resolved as follows.

EPOCH_DAY - If present, this is converted to a LocalDate and all other date fields are then cross-checked against the date. PROLEPTIC_MONTH - If present, then it is split into the YEAR and MONTH_OF_YEAR. If the mode is strict or smart then the field is validated. YEAR_OF_ERA and ERA - If both are present, then they are combined to form a YEAR. In lenient mode, the YEAR_OF_ERA range is not validated, in smart and strict mode it is. The ERA is validated for range in all three modes. If only the YEAR_OF_ERA is present, and the mode is smart or lenient, then the current era (CE/AD) is assumed. In strict mode, no era is assumed and the YEAR_OF_ERA is left untouched. If only the ERA is present, then it is left untouched. YEAR, MONTH_OF_YEAR and DAY_OF_MONTH - If all three are present, then they are combined to form a LocalDate. In all three modes, the YEAR is validated. If the mode is smart or strict, then the month and day are validated, with the day validated from 1 to 31. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first of January in the requested year, then adding the difference in months, then the difference in days. If the mode is smart, and the day-of-month is greater than the maximum for the year-month, then the day-of-month is adjusted to the last day-of-month. If the mode is strict, then the three fields must form a valid date. YEAR and DAY_OF_YEAR - If both are present, then they are combined to form a LocalDate. In all three modes, the YEAR is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first of January in the requested year, then adding the difference in days. If the mode is smart or strict, then the two fields must form a valid date. YEAR, MONTH_OF_YEAR, ALIGNED_WEEK_OF_MONTH and ALIGNED_DAY_OF_WEEK_IN_MONTH - If all four are present, then they are combined to form a LocalDate. In all three modes, the YEAR is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first of January in the requested year, then adding the difference in months, then the difference in weeks, then in days. If the mode is smart or strict, then the all four fields are validated to their outer ranges. The date is then combined in a manner equivalent to creating a date on the first day of the requested year and month, then adding the amount in weeks and days to reach their values. If the mode is strict, the date is additionally validated to check that the day and week adjustment did not change the month. YEAR, MONTH_OF_YEAR, ALIGNED_WEEK_OF_MONTH and DAY_OF_WEEK - If all four are present, then they are combined to form a LocalDate. The approach is the same as described above for years, months and weeks in ALIGNED_DAY_OF_WEEK_IN_MONTH. The day-of-week is adjusted as the next or same matching day-of-week once the years, months and weeks have been handled. YEAR, ALIGNED_WEEK_OF_YEAR and ALIGNED_DAY_OF_WEEK_IN_YEAR - If all three are present, then they are combined to form a LocalDate. In all three modes, the YEAR is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first of January in the requested year, then adding the difference in weeks, then in days. If the mode is smart or strict, then the all three fields are validated to their outer ranges. The date is then combined in a manner equivalent to creating a date on the first day of the requested year, then adding the amount in weeks and days to reach their values. If the mode is strict, the date is additionally validated to check that the day and week adjustment did not change the year. YEAR, ALIGNED_WEEK_OF_YEAR and DAY_OF_WEEK - If all three are present, then they are combined to form a LocalDate. The approach is the same as described above for years and weeks in ALIGNED_DAY_OF_WEEK_IN_YEAR. The day-of-week is adjusted as the next or same matching day-of-week once the years and weeks have been handled.

field-values - the map of fields to values, which can be updated, not null - java.util.Map resolver-style - the requested type of resolve, not null - java.time.format.ResolverStyle

returns: the resolved date, null if insufficient information to create a date - java.time.LocalDate

throws: java.time.DateTimeException - if the date cannot be resolved, typically because of a conflict in the input data

zoned-date-time clj

(zoned-date-time this temporal)

(zoned-date-time this instant zone)

Obtains an ISO zoned date-time in this chronology from an Instant.

This is equivalent to ZonedDateTime.ofInstant(Instant, ZoneId).

instant - the instant to create the date-time from, not null - java.time.Instant zone - the time-zone, not null - java.time.ZoneId

returns: the zoned date-time, not null - java.time.ZonedDateTime

throws: java.time.DateTimeException - if the result exceeds the supported range