Package net.time4j.calendar

Class JulianCalendar

java.lang.Object
net.time4j.engine.ChronoEntity<T>
net.time4j.engine.TimePoint<U,​D>
net.time4j.engine.Calendrical<JulianCalendar.Unit,​JulianCalendar>
net.time4j.calendar.JulianCalendar
All Implemented Interfaces:
Serializable, Comparable<JulianCalendar>, CalendarDate, ChronoDisplay, Temporal<CalendarDate>, LocalizedPatternSupport
@CalendarType("julian") public final class JulianCalendar extends Calendrical<JulianCalendar.Unit,​JulianCalendar> implements LocalizedPatternSupport

Represents the proleptic Julian calendar.

Introduction

It is de facto the ancestor of modern gregorian calendar but does not reflect any historic anomalies and applies its leap year rules even backwards into the far past. The main difference to gregorian calendar is the leap year rule which considers every year as leap year whose number is divisible by four.

Following elements which are declared as constants are registered by this class

Furthermore, all elements defined in EpochDays and CommonElements are supported.

Example of usage

     ChronoFormatter<JulianCalendar> formatter =
       ChronoFormatter.ofPattern(
          "E, d.MMMM yyyy", PatternType.CLDR, Locale.ENGLISH, JulianCalendar.axis());
     PlainDate today = SystemClock.inLocalView().today();
     JulianCalendar julianDate = today.transform(JulianCalendar.class);
     System.out.println(formatter.format(julianDate));

Support for unicode ca-extensions

      Locale locale = Locale.forLanguageTag("en-u-ca-julian");
      ChronoFormatter<CalendarDate> f = ChronoFormatter.ofGenericCalendarStyle(DisplayMode.FULL, locale);
      assertThat(
          f.format(PlainDate.of(2017, 10, 1)),
          is("Sunday, September 18, 2017 AD"));
Since:
3.15/4.12
Author:
Meno Hochschild
See Also:
Serialized Form

  • Field Details

  • Method Details

    • of

      public static JulianCalendar of​(HistoricEra era, int yearOfEra, int month, int dayOfMonth)

      Creates a new instance of a Julian calendar date.

      Parameters:
      era - either HistoricEra.AD or HistoricEra.BC
      yearOfEra - year of era in range 1 until 999,999,999
      month - month (1-12)
      dayOfMonth - day of month (1-31)
      Returns:
      new instance of JulianCalendar
      Throws:
      IllegalArgumentException - in case of any inconsistencies
      Since:
      3.15/4.12

    • of

      public static JulianCalendar of​(HistoricEra era, int yearOfEra, Month month, int dayOfMonth)

      Creates a new instance of a Julian calendar date.

      Parameters:
      era - either HistoricEra.AD or HistoricEra.BC
      yearOfEra - year of era in range 1 until 999,999,999
      month - month (1-12)
      dayOfMonth - day of month (1-31)
      Returns:
      new instance of JulianCalendar
      Throws:
      IllegalArgumentException - in case of any inconsistencies
      Since:
      3.15/4.12

    • nowInSystemTime

      public static JulianCalendar nowInSystemTime()

      Obtains the current calendar date in system time.

      Convenient short-cut for: SystemClock.inLocalView().now(JulianCalendar.axis()).

      Returns:
      current calendar date in system time zone using the system clock
      Since:
      3.23/4.19
      See Also:
      SystemClock.inLocalView(), ZonalClock.now(net.time4j.engine.Chronology)

    • getEra

      public HistoricEra getEra()

      Yields the Julian era.

      Returns:
      either HistoricEra.AD or HistoricEra.BC
      Since:
      3.15/4.12

    • getYear

      public int getYear()

      Yields the Julian year within current era.

      Returns:
      int (1 <= year <= 999,999,999)
      Since:
      3.15/4.12

    • getMonth

      public Month getMonth()

      Yields the Julian month.

      Returns:
      enum
      Since:
      3.15/4.12

    • getDayOfMonth

      public int getDayOfMonth()

      Yields the Julian day of month.

      Returns:
      int
      Since:
      3.15/4.12

    • getDayOfWeek

      public Weekday getDayOfWeek()

      Determines the day of week.

      Returns:
      Weekday
      Since:
      3.15/4.12

    • getDayOfYear

      public int getDayOfYear()

      Yields the Julian day of year.

      Returns:
      int
      Since:
      3.15/4.12

    • lengthOfMonth

      public int lengthOfMonth()

      Yields the length of current Julian month in days.

      Returns:
      int
      Since:
      3.15/4.12

    • lengthOfYear

      public int lengthOfYear()

      Yields the length of current Julian year in days.

      Returns:
      int
      Since:
      3.15/4.12

    • isLeapYear

      public boolean isLeapYear()

      Is the year of this date a leap year?

      Returns:
      boolean
      Since:
      3.15/4.12

    • isValid

      public static boolean isValid​(HistoricEra era, int yearOfEra, int month, int dayOfMonth)

      Queries if given parameter values form a well defined calendar date.

      Parameters:
      era - the era to be checked
      yearOfEra - the year of era to be checked
      month - the month to be checked
      dayOfMonth - the day of month to be checked
      Returns:
      true if valid else false
      Since:
      3.34/4.29
      See Also:
      of(HistoricEra, int, int, int)

    • at

      public GeneralTimestamp<JulianCalendar> at​(PlainTime time)

      Creates a new local timestamp with this date and given wall time.

      If the time T24:00 is used then the resulting timestamp will automatically be normalized such that the timestamp will contain the following day instead.

      Parameters:
      time - wall time
      Returns:
      general timestamp as composition of this date and given time
      Since:
      3.15/4.12

    • atTime

      public GeneralTimestamp<JulianCalendar> atTime​(int hour, int minute)

      Is equivalent to at(PlainTime.of(hour, minute)).

      Parameters:
      hour - hour of day in range (0-24)
      minute - minute of hour in range (0-59)
      Returns:
      general timestamp as composition of this date and given time
      Throws:
      IllegalArgumentException - if any argument is out of range
      Since:
      3.15/4.12

    • equals

      public boolean equals​(Object obj)
      Description copied from class: Calendrical

      Based on the epoch day number and the calendar system.

      In other words: Two date object are equal if they have the same temporal position on the local timeline and have the same calendrical type. Subclasses which define further state attributes must override this method.

      If an only temporal comparison is required then the method Calendrical.isSimultaneous(CalendarDate) is to be used.

      Overrides:
      equals in class Calendrical<JulianCalendar.Unit,​JulianCalendar>
      See Also:
      Chronology.getChronoType()

    • hashCode

      public int hashCode()
      Description copied from class: Calendrical

      Based on the epoch day number.

      Overrides:
      hashCode in class Calendrical<JulianCalendar.Unit,​JulianCalendar>

    • toString

      public String toString()
      Description copied from class: TimePoint

      Provides a complete textual representation of the state of this time point.

      The textual description often follows the conventions of ISO-8601. Usually the description starts with the chronological informations which are coarse-grained and ends with those ones which are fine-grained (for example the ISO-notation YYYY-MM-DD).

      Specified by:
      toString in class TimePoint<JulianCalendar.Unit,​JulianCalendar>

    • getDefaultWeekmodel

      public static Weekmodel getDefaultWeekmodel()

      Obtains the standard week model of this calendar.

      The Julian calendar usually starts on Sunday.

      Returns:
      Weekmodel
      Since:
      3.24/4.20

    • axis

      public static TimeAxis<JulianCalendar.Unit,​JulianCalendar> axis()

      Returns the associated time axis.

      Returns:
      chronology
      Since:
      3.15/4.12