Class CopticChronology

All Implemented Interfaces:
Serializable

public final class CopticChronology extends AssembledChronology
Implements the Coptic calendar system, which defines every fourth year as leap, much like the Julian calendar. The year is broken down into 12 months, each 30 days in length. An extra period at the end of the year is either 5 or 6 days in length. In this implementation, it is considered a 13th month.

Year 1 in the Coptic calendar began on August 29, 284 CE (Julian), thus Coptic years do not begin at the same time as Julian years. This chronology is not proleptic, as it does not allow dates before the first Coptic year.

This implementation defines a day as midnight to midnight exactly as per the ISO chronology. Some references indicate that a coptic day starts at sunset on the previous ISO day, but this has not been confirmed and is not implemented.

CopticChronology is thread-safe and immutable.

Since:
1.0
Author:
Brian S O'Neill
See Also:
  • Field Details

    • AM

      public static final int AM
      Constant value for 'Anno Martyrum' or 'Era of the Martyrs', equivalent to the value returned for AD/CE.
      See Also:
  • Method Details

    • getInstanceUTC

      public static CopticChronology getInstanceUTC()
      Gets an instance of the CopticChronology. The time zone of the returned instance is UTC.
      Returns:
      a singleton UTC instance of the chronology
    • getInstance

      public static CopticChronology getInstance()
      Gets an instance of the CopticChronology in the default time zone.
      Returns:
      a chronology in the default time zone
    • getInstance

      public static CopticChronology getInstance(DateTimeZone zone)
      Gets an instance of the CopticChronology in the given time zone.
      Parameters:
      zone - the time zone to get the chronology in, null is default
      Returns:
      a chronology in the specified time zone
    • getInstance

      public static CopticChronology getInstance(DateTimeZone zone, int minDaysInFirstWeek)
      Gets an instance of the CopticChronology in the given time zone.
      Parameters:
      zone - the time zone to get the chronology in, null is default
      minDaysInFirstWeek - minimum number of days in first week of the year; default is 4
      Returns:
      a chronology in the specified time zone
    • withUTC

      public Chronology withUTC()
      Gets the Chronology in the UTC time zone.
      Specified by:
      withUTC in class BaseChronology
      Returns:
      the chronology in UTC
    • withZone

      public Chronology withZone(DateTimeZone zone)
      Gets the Chronology in a specific time zone.
      Specified by:
      withZone in class BaseChronology
      Parameters:
      zone - the zone to get the chronology in, null is default
      Returns:
      the chronology
      See Also:
    • assemble

      protected void assemble(AssembledChronology.Fields fields)
      Description copied from class: AssembledChronology
      Invoked by the constructor and after deserialization to allow subclasses to define all of its supported fields. All unset fields default to unsupported instances.
      Parameters:
      fields - container of fields
    • getZone

      public DateTimeZone getZone()
      Description copied from class: BaseChronology
      Returns the DateTimeZone that this Chronology operates in, or null if unspecified.
      Overrides:
      getZone in class AssembledChronology
      Returns:
      DateTimeZone null if unspecified
    • getDateTimeMillis

      public long getDateTimeMillis(int year, int monthOfYear, int dayOfMonth, int millisOfDay) throws IllegalArgumentException
      Description copied from class: BaseChronology
      Returns a datetime millisecond instant, formed from the given year, month, day, and millisecond values. The set of given values must refer to a valid datetime, or else an IllegalArgumentException is thrown.

      The default implementation calls upon separate DateTimeFields to determine the result. Subclasses are encouraged to provide a more efficient implementation.

      Overrides:
      getDateTimeMillis in class AssembledChronology
      Parameters:
      year - year to use
      monthOfYear - month to use
      dayOfMonth - day of month to use
      millisOfDay - millisecond to use
      Returns:
      millisecond instant from 1970-01-01T00:00:00Z
      Throws:
      IllegalArgumentException - if the values are invalid
    • getDateTimeMillis

      public long getDateTimeMillis(int year, int monthOfYear, int dayOfMonth, int hourOfDay, int minuteOfHour, int secondOfMinute, int millisOfSecond) throws IllegalArgumentException
      Description copied from class: BaseChronology
      Returns a datetime millisecond instant, formed from the given year, month, day, hour, minute, second, and millisecond values. The set of given values must refer to a valid datetime, or else an IllegalArgumentException is thrown.

      The default implementation calls upon separate DateTimeFields to determine the result. Subclasses are encouraged to provide a more efficient implementation.

      Overrides:
      getDateTimeMillis in class AssembledChronology
      Parameters:
      year - year to use
      monthOfYear - month to use
      dayOfMonth - day of month to use
      hourOfDay - hour to use
      minuteOfHour - minute to use
      secondOfMinute - second to use
      millisOfSecond - millisecond to use
      Returns:
      millisecond instant from 1970-01-01T00:00:00Z
      Throws:
      IllegalArgumentException - if the values are invalid
    • getMinimumDaysInFirstWeek

      public int getMinimumDaysInFirstWeek()
    • equals

      public boolean equals(Object obj)
      Checks if this chronology instance equals another.
      Overrides:
      equals in class Object
      Parameters:
      obj - the object to compare to
      Returns:
      true if equal
      Since:
      1.6
    • hashCode

      public int hashCode()
      A suitable hash code for the chronology.
      Overrides:
      hashCode in class Object
      Returns:
      the hash code
      Since:
      1.6
    • toString

      public String toString()
      Gets a debugging toString.
      Specified by:
      toString in class BaseChronology
      Returns:
      a debugging string