DateComponents (ORbit Extrapolation KIT 9.1 API)

java.lang.Object
- org.orekit.time.DateComponents

All Implemented Interfaces:

Serializable, Comparable<DateComponents>
```
public class DateComponents
extends Object
implements Serializable, Comparable<DateComponents>
```
Class representing a date broken up as year, month and day components.
This class uses the astronomical convention for calendars, which is also the convention used by java.util.Date: a year zero is present between years -1 and +1, and 10 days are missing in 1582. The calendar used around these special dates are:
- up to 0000-12-31 : proleptic julian calendar
- from 0001-01-01 to 1582-10-04: julian calendar
- from 1582-10-15: gregorian calendar
Instances of this class are guaranteed to be immutable.
Author:

Luc Maisonobe

See Also:

TimeComponents, DateTimeComponents, Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static DateComponents`	`CCSDS_EPOCH` Reference epoch for CCSDS Time Code Format (CCSDS 301.0-B-4): 1958-01-01.
`static DateComponents`	`FIFTIES_EPOCH` Reference epoch for 1950 dates: 1950-01-01.
`static DateComponents`	`GALILEO_EPOCH` Reference epoch for Galileo System Time: 1999-08-22.
`static DateComponents`	`GPS_EPOCH` Reference epoch for GPS weeks: 1980-01-06.
`static DateComponents`	`J2000_EPOCH` J2000.0 Reference epoch: 2000-01-01.
`static DateComponents`	`JAVA_EPOCH` Java Reference epoch: 1970-01-01.
`static DateComponents`	`JULIAN_EPOCH` Reference epoch for julian dates: -4712-01-01.
`static DateComponents`	`MAX_EPOCH` Maximum supported date.
`static DateComponents`	`MIN_EPOCH` Maximum supported date.
`static DateComponents`	`MODIFIED_JULIAN_EPOCH` Reference epoch for modified julian dates: 1858-11-17.

Constructor Summary

Constructors
Constructor and Description
`DateComponents(DateComponents epoch, int offset)` Build a date from its offset with respect to a reference epoch.
`DateComponents(int offset)` Build a date from its offset with respect to a `J2000_EPOCH`.
`DateComponents(int year, int dayNumber)` Build a date from a year and day number.
`DateComponents(int year, int month, int day)` Build a date from its components.
`DateComponents(int year, Month month, int day)` Build a date from its components.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`int`	`compareTo(DateComponents other)`
`static DateComponents`	`createFromWeekComponents(int wYear, int week, int dayOfWeek)` Build a date from week components.
`boolean`	`equals(Object other)`
`int`	`getCalendarWeek()` Get the calendar week number.
`int`	`getDay()` Get the day.
`int`	`getDayOfWeek()` Get the day of week.
`int`	`getDayOfYear()` Get the day number in year.
`int`	`getJ2000Day()` Get the day number with respect to J2000 epoch.
`int`	`getMJD()` Get the modified julian day.
`int`	`getMonth()` Get the month.
`Month`	`getMonthEnum()` Get the month as an enumerate.
`int`	`getYear()` Get the year number.
`int`	`hashCode()`
`static DateComponents`	`parseDate(String string)` Parse a string in ISO-8601 format to build a date.
`String`	`toString()` Get a string representation (ISO-8601) of the date.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - JULIAN_EPOCH
```
public static final DateComponents JULIAN_EPOCH
```
    Reference epoch for julian dates: -4712-01-01.
    Both java.util.Date and DateComponents classes follow the astronomical conventions and consider a year 0 between years -1 and +1, hence this reference date lies in year -4712 and not in year -4713 as can be seen in other documents or programs that obey a different convention (for example the convcal utility).
  - MODIFIED_JULIAN_EPOCH
```
public static final DateComponents MODIFIED_JULIAN_EPOCH
```
    Reference epoch for modified julian dates: 1858-11-17.
  - FIFTIES_EPOCH
```
public static final DateComponents FIFTIES_EPOCH
```
    Reference epoch for 1950 dates: 1950-01-01.
  - CCSDS_EPOCH
```
public static final DateComponents CCSDS_EPOCH
```
    Reference epoch for CCSDS Time Code Format (CCSDS 301.0-B-4): 1958-01-01.
  - GALILEO_EPOCH
```
public static final DateComponents GALILEO_EPOCH
```
    Reference epoch for Galileo System Time: 1999-08-22.
  - GPS_EPOCH
```
public static final DateComponents GPS_EPOCH
```
    Reference epoch for GPS weeks: 1980-01-06.
  - J2000_EPOCH
```
public static final DateComponents J2000_EPOCH
```
    J2000.0 Reference epoch: 2000-01-01.
  - JAVA_EPOCH
```
public static final DateComponents JAVA_EPOCH
```
    Java Reference epoch: 1970-01-01.
  - MAX_EPOCH
```
public static final DateComponents MAX_EPOCH
```
    Maximum supported date.
    This is date 5881610-07-11 which corresponds to Integer.MAX_VALUE days after J2000_EPOCH.
    
    Since:
    
    9.0
  - MIN_EPOCH
```
public static final DateComponents MIN_EPOCH
```
    Maximum supported date.
    This is date -5877490-03-03, which corresponds to Integer.MIN_VALUE days before J2000_EPOCH.
    
    Since:
    
    9.0
- Constructor Detail
  - DateComponents
```
public DateComponents(int year,
                      int month,
                      int day)
               throws IllegalArgumentException
```
    Build a date from its components.
    
    Parameters:
    
    year - year number (may be 0 or negative for BC years)
    
    month - month number from 1 to 12
    
    day - day number from 1 to 31
    
    Throws:
    
    IllegalArgumentException - if inconsistent arguments are given (parameters out of range, february 29 for non-leap years, dates during the gregorian leap in 1582 ...)
  - DateComponents
```
public DateComponents(int year,
                      Month month,
                      int day)
               throws IllegalArgumentException
```
    Build a date from its components.
    
    Parameters:
    
    year - year number (may be 0 or negative for BC years)
    
    month - month enumerate
    
    day - day number from 1 to 31
    
    Throws:
    
    IllegalArgumentException - if inconsistent arguments are given (parameters out of range, february 29 for non-leap years, dates during the gregorian leap in 1582 ...)
  - DateComponents
```
public DateComponents(int year,
                      int dayNumber)
               throws IllegalArgumentException
```
    Build a date from a year and day number.
    
    Parameters:
    
    year - year number (may be 0 or negative for BC years)
    
    dayNumber - day number in the year from 1 to 366
    
    Throws:
    
    IllegalArgumentException - if dayNumber is out of range with respect to year
  - DateComponents
```
public DateComponents(int offset)
```
    Build a date from its offset with respect to a J2000_EPOCH.
    
    Parameters:
    
    offset - offset with respect to a J2000_EPOCH
    
    See Also:
    
    getJ2000Day()
  - DateComponents
```
public DateComponents(DateComponents epoch,
                      int offset)
```
    Build a date from its offset with respect to a reference epoch.
    This constructor is mainly useful to build a date from a modified julian day (using MODIFIED_JULIAN_EPOCH) or a GPS week number (using GPS_EPOCH).
    
    Parameters:
    
    epoch - reference epoch
    
    offset - offset with respect to a reference epoch
    
    See Also:
    
    DateComponents(int), getMJD()
- Method Detail
  - createFromWeekComponents
```
public static DateComponents createFromWeekComponents(int wYear,
                                                      int week,
                                                      int dayOfWeek)
                                               throws IllegalArgumentException
```
    Build a date from week components.
    The calendar week number is a number between 1 and 52 or 53 depending on the year. Week 1 is defined by ISO as the one that includes the first Thursday of a year. Week 1 may therefore start the previous year and week 52 or 53 may end in the next year. As an example calendar date 1995-01-01 corresponds to week date 1994-W52-7 (i.e. Sunday in the last week of 1994 is in fact the first day of year 1995). This date would beAnother example is calendar date 1996-12-31 which corresponds to week date 1997-W01-2 (i.e. Tuesday in the first week of 1997 is in fact the last day of year 1996).
    
    Parameters:
    
    wYear - year associated to week numbering
    
    week - week number in year, from 1 to 52 or 53
    
    dayOfWeek - day of week, from 1 (Monday) to 7 (Sunday)
    
    Returns:
    
    a builded date
    
    Throws:
    
    IllegalArgumentException - if inconsistent arguments are given (parameters out of range, week 53 on a 52 weeks year ...)
  - parseDate
```
public static DateComponents parseDate(String string)
```
    Parse a string in ISO-8601 format to build a date.
    The supported formats are:
    - basic format calendar date: YYYYMMDD
    - extended format calendar date: YYYY-MM-DD
    - basic format ordinal date: YYYYDDD
    - extended format ordinal date: YYYY-DDD
    - basic format week date: YYYYWwwD
    - extended format week date: YYYY-Www-D
    As shown by the list above, only the complete representations defined in section 4.1 of ISO-8601 standard are supported, neither expended representations nor representations with reduced accuracy are supported.
    Parsing a single integer as a julian day is not supported as it may be ambiguous with either the basic format calendar date or the basic format ordinal date depending on the number of digits.
    Parameters:
    
    string - string to parse
    
    Returns:
    
    a parsed date
    
    Throws:
    
    IllegalArgumentException - if string cannot be parsed
  - getYear
```
public int getYear()
```
    Get the year number.
    
    Returns:
    
    year number (may be 0 or negative for BC years)
  - getMonth
```
public int getMonth()
```
    Get the month.
    
    Returns:
    
    month number from 1 to 12
  - getMonthEnum
```
public Month getMonthEnum()
```
    Get the month as an enumerate.
    
    Returns:
    
    month as an enumerate
  - getDay
```
public int getDay()
```
    Get the day.
    
    Returns:
    
    day number from 1 to 31
  - getJ2000Day
```
public int getJ2000Day()
```
    Get the day number with respect to J2000 epoch.
    
    Returns:
    
    day number with respect to J2000 epoch
  - getMJD
```
public int getMJD()
```
    Get the modified julian day.
    
    Returns:
    
    modified julian day
  - getCalendarWeek
```
public int getCalendarWeek()
```
    Get the calendar week number.
    The calendar week number is a number between 1 and 52 or 53 depending on the year. Week 1 is defined by ISO as the one that includes the first Thursday of a year. Week 1 may therefore start the previous year and week 52 or 53 may end in the next year. As an example calendar date 1995-01-01 corresponds to week date 1994-W52-7 (i.e. Sunday in the last week of 1994 is in fact the first day of year 1995). Another example is calendar date 1996-12-31 which corresponds to week date 1997-W01-2 (i.e. Tuesday in the first week of 1997 is in fact the last day of year 1996).
    
    Returns:
    
    calendar week number
  - getDayOfWeek
```
public int getDayOfWeek()
```
    Get the day of week.
    Day of week is a number between 1 (Monday) and 7 (Sunday).
    
    Returns:
    
    day of week
  - getDayOfYear
```
public int getDayOfYear()
```
    Get the day number in year.
    Day number in year is between 1 (January 1st) and either 365 or 366 inclusive depending on year.
    
    Returns:
    
    day number in year
  - toString
```
public String toString()
```
    Get a string representation (ISO-8601) of the date.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    string representation of the date.
  - compareTo
```
public int compareTo(DateComponents other)
```
    Specified by:
    
    compareTo in interface Comparable<DateComponents>
  - equals
```
public boolean equals(Object other)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object

Class DateComponents

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

JULIAN_EPOCH

MODIFIED_JULIAN_EPOCH

FIFTIES_EPOCH

CCSDS_EPOCH

GALILEO_EPOCH

GPS_EPOCH

J2000_EPOCH

JAVA_EPOCH

MAX_EPOCH

MIN_EPOCH

Constructor Detail

DateComponents

DateComponents

DateComponents

DateComponents

DateComponents

Method Detail

createFromWeekComponents

parseDate

getYear

getMonth

getMonthEnum

getDay

getJ2000Day

getMJD

getCalendarWeek

getDayOfWeek

getDayOfYear

toString

compareTo

equals

hashCode