java.lang.Object
- org.orekit.time.FieldAbsoluteDate<T>

Type Parameters:

T - type of the field elements

All Implemented Interfaces:

Comparable<FieldAbsoluteDate<T>>, FieldTimeShiftable<FieldAbsoluteDate<T>,T>, FieldTimeStamped<T>, TimeShiftable<FieldAbsoluteDate<T>>
```
public class FieldAbsoluteDate<T extends CalculusFieldElement<T>>
extends Object
implements FieldTimeStamped<T>, FieldTimeShiftable<FieldAbsoluteDate<T>,T>, Comparable<FieldAbsoluteDate<T>>
```
This class represents a specific instant in time.
Instances of this class are considered to be absolute in the sense that each one represent the occurrence of some event and can be compared to other instances or located in any time scale. In other words the different locations of an event with respect to two different time scales (say TAI and UTC for example) are simply different perspective related to a single object. Only one FieldAbsoluteDate<T> instance is needed, both representations being available from this single instance by specifying the time scales as parameter when calling the ad-hoc methods.

Since an instance is not bound to a specific time-scale, all methods related to the location of the date within some time scale require to provide the time scale as an argument. It is therefore possible to define a date in one time scale and to use it in another one. An example of such use is to read a date from a file in UTC and write it in another file in TAI. This can be done as follows:
```
   DateTimeComponents utcComponents = readNextDate();
   FieldAbsoluteDate<T> date = new FieldAbsoluteDate<>(utcComponents, TimeScalesFactory.getUTC());
   writeNextDate(date.getComponents(TimeScalesFactory.getTAI()));
 
```
Two complementary views are available:
- location view (mainly for input/output or conversions)
  
  locations represent the coordinate of one event with respect to a time scale. The related methods are FieldAbsoluteDate(Field, DateComponents, TimeComponents, TimeScale), FieldAbsoluteDate(Field, int, int, int, int, int, double, TimeScale), FieldAbsoluteDate(Field, int, int, int, TimeScale), FieldAbsoluteDate(Field, Date, TimeScale), createGPSDate(int, CalculusFieldElement), parseCCSDSCalendarSegmentedTimeCode(byte, byte[]), toDate(TimeScale), toString(timeScale), toString(), and timeScalesOffset(org.orekit.time.TimeScale, org.orekit.time.TimeScale).
- offset view (mainly for physical computation)
  
  offsets represent either the flow of time between two events (two instances of the class) or durations. They are counted in seconds, are continuous and could be measured using only a virtually perfect stopwatch. The related methods are FieldAbsoluteDate(FieldAbsoluteDate, double), parseCCSDSUnsegmentedTimeCode(Field, byte, byte, byte[], FieldAbsoluteDate), parseCCSDSDaySegmentedTimeCode(Field, byte, byte[], DateComponents), durationFrom(FieldAbsoluteDate), compareTo(FieldAbsoluteDate), equals(Object) and hashCode().
A few reference epochs which are commonly used in space systems have been defined. These epochs can be used as the basis for offset computation. The supported epochs are: getJulianEpoch(Field), getModifiedJulianEpoch(Field), getFiftiesEpoch(Field), getCCSDSEpoch(Field), getGalileoEpoch(Field), getGPSEpoch(Field), getJ2000Epoch(Field), getJavaEpoch(Field). There are also two factory methods createJulianEpoch(CalculusFieldElement) and createBesselianEpoch(CalculusFieldElement) that can be used to compute other reference epochs like J1900.0 or B1950.0. In addition to these reference epochs, two other constants are defined for convenience: getPastInfinity(Field) and getFutureInfinity(Field), which can be used either as dummy dates when a date is not yet initialized, or for initialization of loops searching for a min or max date.

Instances of the FieldAbsoluteDate<T> class are guaranteed to be immutable.
Author:

Luc Maisonobe

See Also:

TimeScale, TimeStamped, ChronologicalComparator

Constructor Summary

Constructors
Constructor	Description
`FieldAbsoluteDate(Field<T> field)`	Create an instance with a default value (`getJ2000Epoch(Field)`).
`FieldAbsoluteDate(Field<T> field, int year, int month, int day, int hour, int minute, double second, TimeScale timeScale)`	Build an instance from a location in a `time scale`.
`FieldAbsoluteDate(Field<T> field, int year, int month, int day, TimeScale timeScale)`	Build an instance from a location in a `time scale`.
`FieldAbsoluteDate(Field<T> field, int year, Month month, int day, int hour, int minute, double second, TimeScale timeScale)`	Build an instance from a location in a `time scale`.
`FieldAbsoluteDate(Field<T> field, int year, Month month, int day, TimeScale timeScale)`	Build an instance from a location in a `time scale`.
`FieldAbsoluteDate(Field<T> field, String location, TimeScale timeScale)`	Build an instance from a location (parsed from a string) in a `time scale`.
`FieldAbsoluteDate(Field<T> field, Instant instant)`	Build an instance from an `instant` in utc time scale.
`FieldAbsoluteDate(Field<T> field, Instant instant, TimeScale timeScale)`	Build an instance from an `instant` in a `time scale`.
`FieldAbsoluteDate(Field<T> field, Instant instant, UTCScale utcScale)`	Build an instance from an `instant` in the `time scale`.
`FieldAbsoluteDate(Field<T> field, Date location, TimeScale timeScale)`	Build an instance from a location in a `time scale`.
`FieldAbsoluteDate(Field<T> field, AbsoluteDate date)`	Build an instance from an AbsoluteDate.
`FieldAbsoluteDate(Field<T> field, DateComponents date, TimeComponents time, TimeScale timeScale)`	Build an instance from a location in a `time scale`.
`FieldAbsoluteDate(Field<T> field, DateComponents date, TimeScale timeScale)`	Build an instance from a location in a `time scale`.
`FieldAbsoluteDate(Field<T> field, DateTimeComponents location, TimeScale timeScale)`	Build an instance from a location in a `time scale`.
`FieldAbsoluteDate(AbsoluteDate since, long elapsedDuration, TimeUnit timeUnit, Field<T> field)`	Build an instance from an elapsed duration since to another instant.
`FieldAbsoluteDate(AbsoluteDate since, T elapsedDuration)`	Build an instance from an elapsed duration since to another instant.
`FieldAbsoluteDate(FieldAbsoluteDate<T> since, double elapsedDuration)`	Build an instance from an elapsed duration since to another instant.
`FieldAbsoluteDate(FieldAbsoluteDate<T> reference, double apparentOffset, TimeScale timeScale)`	Build an instance from an apparent clock offset with respect to another instant in the perspective of a specific `time scale`.
`FieldAbsoluteDate(FieldAbsoluteDate<T> since, long elapsedDuration, TimeUnit timeUnit)`	Build an instance from an elapsed duration since to another instant.
`FieldAbsoluteDate(FieldAbsoluteDate<T> since, T elapsedDuration)`	Build an instance from an elapsed duration since to another instant.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`compareTo(FieldAbsoluteDate<T> date)`	Compare the instance with another date.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`createBesselianEpoch(T besselianEpoch)`	Build an instance corresponding to a Besselian Epoch (BE).
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`createBesselianEpoch(T besselianEpoch, TimeScales timeScales)`	Build an instance corresponding to a Besselian Epoch (BE).
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`createGPSDate(int weekNumber, T milliInWeek)`	Build an instance corresponding to a GPS date.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`createGPSDate(int weekNumber, T milliInWeek, TimeScale gps)`	Build an instance corresponding to a GPS date.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`createJDDate(int jd, T secondsSinceNoon, TimeScale timeScale)`	Build an instance corresponding to a Julian Day date.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`createJDDate(int jd, T secondsSinceNoon, TimeScale timeScale, TimeScale pivotTimeScale)`	Build an instance corresponding to a Julian Day date.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`createJulianEpoch(T julianEpoch)`	Build an instance corresponding to a Julian Epoch (JE).
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`createJulianEpoch(T julianEpoch, TimeScales timeScales)`	Build an instance corresponding to a Julian Epoch (JE).
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`createMJDDate(int mjd, T secondsInDay, TimeScale timeScale)`	Build an instance corresponding to a Modified Julian Day date.
`T`	`durationFrom(AbsoluteDate instant)`	Compute the physically elapsed duration between two instants.
`T`	`durationFrom(AbsoluteDate instant, TimeUnit timeUnit)`	Compute the physically elapsed duration between two instants.
`T`	`durationFrom(FieldAbsoluteDate<T> instant)`	Compute the physically elapsed duration between two instants.
`T`	`durationFrom(FieldAbsoluteDate<T> instant, TimeUnit timeUnit)`	Compute the physically elapsed duration between two instants.
`boolean`	`equals(Object date)`	Check if the instance represents the same time as another instance.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getArbitraryEpoch(Field<T> field)`	Get an arbitrary date.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getCCSDSEpoch(Field<T> field)`	Reference epoch for CCSDS Time Code Format (CCSDS 301.0-B-4).
`DateTimeComponents`	`getComponents(int minutesFromUTC)`	Split the instance into date/time components for a local time.
`DateTimeComponents`	`getComponents(int minutesFromUTC, TimeScale utc)`	Split the instance into date/time components for a local time.
`DateTimeComponents`	`getComponents(TimeZone timeZone)`	Split the instance into date/time components for a time zone.
`DateTimeComponents`	`getComponents(TimeZone timeZone, TimeScale utc)`	Split the instance into date/time components for a time zone.
`DateTimeComponents`	`getComponents(TimeScale timeScale)`	Split the instance into date/time components.
`FieldAbsoluteDate<T>`	`getDate()`	Get the date.
`Field<T>`	`getField()`	Get the field.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getFiftiesEpoch(Field<T> field)`	Reference epoch for 1950 dates: 1950-01-01T00:00:00 Terrestrial Time.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getFutureInfinity(Field<T> field)`	Dummy date at infinity in the future direction.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getGalileoEpoch(Field<T> field)`	Reference epoch for Galileo System Time: 1999-08-22T00:00:00 UTC.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getGPSEpoch(Field<T> field)`	Reference epoch for GPS weeks: 1980-01-06T00:00:00 GPS time.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getJ2000Epoch(Field<T> field)`	J2000.0 Reference epoch: 2000-01-01T12:00:00 Terrestrial Time (not UTC).
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getJavaEpoch(Field<T> field)`	Java Reference epoch: 1970-01-01T00:00:00 Universal Time Coordinate.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getJulianEpoch(Field<T> field)`	Reference epoch for julian dates: -4712-01-01T12:00:00 Terrestrial Time.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getModifiedJulianEpoch(Field<T> field)`	Reference epoch for modified julian dates: 1858-11-17T00:00:00 Terrestrial Time.
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`getPastInfinity(Field<T> field)`	Dummy date at infinity in the past direction.
`int`	`hashCode()`	Get a hashcode for this date.
`boolean`	`hasZeroField()`	Check if the Field is semantically equal to zero.
`boolean`	`isAfter(FieldTimeStamped<T> other)`	Check if the instance represents a time that is strictly after another.
`boolean`	`isAfterOrEqualTo(FieldTimeStamped<T> other)`	Check if the instance represents a time that is after or equal to another.
`boolean`	`isBefore(FieldTimeStamped<T> other)`	Check if the instance represents a time that is strictly before another.
`boolean`	`isBeforeOrEqualTo(FieldTimeStamped<T> other)`	Check if the instance represents a time that is before or equal to another.
`boolean`	`isBetween(FieldTimeStamped<T> boundary, FieldTimeStamped<T> otherBoundary)`	Check if the instance represents a time that is strictly between two others representing the boundaries of a time span.
`boolean`	`isBetweenOrEqualTo(FieldTimeStamped<T> boundary, FieldTimeStamped<T> otherBoundary)`	Check if the instance represents a time that is between two others representing the boundaries of a time span, or equal to one of them.
`boolean`	`isCloseTo(FieldTimeStamped<T> other, double tolerance)`	Check if the instance time is close to another.
`boolean`	`isEqualTo(FieldTimeStamped<T> other)`	Check if the instance represents the same time as another.
`T`	`offsetFrom(FieldAbsoluteDate<T> instant, TimeScale timeScale)`	Compute the apparent clock offset between two instant in the perspective of a specific `time scale`.
`FieldAbsoluteDate<T>`	`parseCCSDSCalendarSegmentedTimeCode(byte preambleField, byte[] timeField)`	Build an instance from a CCSDS Calendar Segmented Time Code (CCS).
`FieldAbsoluteDate<T>`	`parseCCSDSCalendarSegmentedTimeCode(byte preambleField, byte[] timeField, TimeScale utc)`	Build an instance from a CCSDS Calendar Segmented Time Code (CCS).
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`parseCCSDSDaySegmentedTimeCode(Field<T> field, byte preambleField, byte[] timeField, DateComponents agencyDefinedEpoch)`	Build an instance from a CCSDS Day Segmented Time Code (CDS).
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`parseCCSDSDaySegmentedTimeCode(Field<T> field, byte preambleField, byte[] timeField, DateComponents agencyDefinedEpoch, TimeScale utc)`	Build an instance from a CCSDS Day Segmented Time Code (CDS).
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`parseCCSDSUnsegmentedTimeCode(Field<T> field, byte preambleField1, byte preambleField2, byte[] timeField, FieldAbsoluteDate<T> agencyDefinedEpoch)`	Build an instance from a CCSDS Unsegmented Time Code (CUC).
`static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T>`	`parseCCSDSUnsegmentedTimeCode(Field<T> field, byte preambleField1, byte preambleField2, byte[] timeField, FieldAbsoluteDate<T> agencyDefinedEpoch, FieldAbsoluteDate<T> ccsdsEpoch)`	Build an instance from a CCSDS Unsegmented Time Code (CUC).
`FieldAbsoluteDate<T>`	`shiftedBy(double dt)`	Get a time-shifted date.
`FieldAbsoluteDate<T>`	`shiftedBy(long dt, TimeUnit timeUnit)`	Get a time-shifted date.
`FieldAbsoluteDate<T>`	`shiftedBy(T dt)`	Get a time-shifted date.
`T`	`timeScalesOffset(TimeScale scale1, TimeScale scale2)`	Compute the offset between two time scales at the current instant.
`AbsoluteDate`	`toAbsoluteDate()`	Transform the FieldAbsoluteDate in an AbsoluteDate.
`Date`	`toDate(TimeScale timeScale)`	Convert the instance to a Java `Date`.
`Instant`	`toInstant()`	Convert the instance to a Java `Instant`.
`Instant`	`toInstant(TimeScales timeScales)`	Convert the instance to a Java `Instant`.
`String`	`toString()`	Get a String representation of the instant location with up to 16 digits of precision for the seconds value.
`String`	`toString(int minutesFromUTC)`	Get a String representation of the instant location for a local time.
`String`	`toString(int minutesFromUTC, TimeScale utc)`	Get a String representation of the instant location for a local time.
`String`	`toString(TimeZone timeZone)`	Get a String representation of the instant location for a time zone.
`String`	`toString(TimeZone timeZone, TimeScale utc)`	Get a String representation of the instant location for a time zone.
`String`	`toString(TimeScale timeScale)`	Get a String representation of the instant location in ISO-8601 format without the UTC offset and with up to 16 digits of precision for the seconds value.
`String`	`toStringWithoutUtcOffset(TimeScale timeScale, int fractionDigits)`	Return a string representation of this date-time, rounded to the given precision.

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

Methods inherited from interface org.orekit.time.FieldTimeStamped
durationFrom

- Constructor Detail
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         AbsoluteDate date)
```
    Build an instance from an AbsoluteDate.
    
    Parameters:
    
    field - used by default
    
    date - AbsoluteDate to instantiate as a FieldAbsoluteDate
  - FieldAbsoluteDate
```
@DefaultDataContext
public FieldAbsoluteDate(Field<T> field)
```
    Create an instance with a default value (getJ2000Epoch(Field)).
    This method uses the default data context.
    
    Parameters:
    
    field - field used by default
    
    See Also:
    
    FieldAbsoluteDate(Field, AbsoluteDate)
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(FieldAbsoluteDate<T> since,
                         T elapsedDuration)
```
    Build an instance from an elapsed duration since to another instant.
    It is important to note that the elapsed duration is not the difference between two readings on a time scale. As an example, the duration between the two instants leading to the readings 2005-12-31T23:59:59 and 2006-01-01T00:00:00 in the UTC time scale is not 1 second, but a stop watch would have measured an elapsed duration of 2 seconds between these two instances because a leap second was introduced at the end of 2005 in this time scale.
    
    This constructor is the reverse of the durationFrom(FieldAbsoluteDate) method.
    
    Parameters:
    
    since - start instant of the measured duration
    
    elapsedDuration - physically elapsed duration from the since instant, as measured in a regular time scale
    
    See Also:
    
    durationFrom(FieldAbsoluteDate)
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         String location,
                         TimeScale timeScale)
```
    Build an instance from a location (parsed from a string) in a time scale.
    The supported formats for location are mainly the ones defined in ISO-8601 standard, the exact subset is explained in DateTimeComponents.parseDateTime(String), DateComponents.parseDate(String) and TimeComponents.parseTime(String).
    
    As CCSDS ASCII calendar segmented time code is a trimmed down version of ISO-8601, it is also supported by this constructor.
    
    Parameters:
    
    field - field utilized by default
    
    location - location in the time scale, must be in a supported format
    
    timeScale - time scale
    
    Throws:
    
    IllegalArgumentException - if location string is not in a supported format
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         DateTimeComponents location,
                         TimeScale timeScale)
```
    Build an instance from a location in a time scale.
    
    Parameters:
    
    field - field utilized by default
    
    location - location in the time scale
    
    timeScale - time scale
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         DateComponents date,
                         TimeComponents time,
                         TimeScale timeScale)
```
    Build an instance from a location in a time scale.
    
    Parameters:
    
    field - field utilized by default
    
    date - date location in the time scale
    
    time - time location in the time scale
    
    timeScale - time scale
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         int year,
                         int month,
                         int day,
                         int hour,
                         int minute,
                         double second,
                         TimeScale timeScale)
                  throws IllegalArgumentException
```
    Build an instance from a location in a time scale.
    
    Parameters:
    
    field - field utilized by default
    
    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
    
    hour - hour number from 0 to 23
    
    minute - minute number from 0 to 59
    
    second - second number from 0.0 to 60.0 (excluded)
    
    timeScale - time scale
    
    Throws:
    
    IllegalArgumentException - if inconsistent arguments are given (parameters out of range)
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         int year,
                         Month month,
                         int day,
                         int hour,
                         int minute,
                         double second,
                         TimeScale timeScale)
                  throws IllegalArgumentException
```
    Build an instance from a location in a time scale.
    
    Parameters:
    
    field - field utilized by default
    
    year - year number (may be 0 or negative for BC years)
    
    month - month enumerate
    
    day - day number from 1 to 31
    
    hour - hour number from 0 to 23
    
    minute - minute number from 0 to 59
    
    second - second number from 0.0 to 60.0 (excluded)
    
    timeScale - time scale
    
    Throws:
    
    IllegalArgumentException - if inconsistent arguments are given (parameters out of range)
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         DateComponents date,
                         TimeScale timeScale)
                  throws IllegalArgumentException
```
    Build an instance from a location in a time scale.
    The hour is set to 00:00:00.000.
    
    Parameters:
    
    field - field utilized by default
    
    date - date location in the time scale
    
    timeScale - time scale
    
    Throws:
    
    IllegalArgumentException - if inconsistent arguments are given (parameters out of range)
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         int year,
                         int month,
                         int day,
                         TimeScale timeScale)
                  throws IllegalArgumentException
```
    Build an instance from a location in a time scale.
    The hour is set to 00:00:00.000.
    
    Parameters:
    
    field - field utilized by default
    
    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
    
    timeScale - time scale
    
    Throws:
    
    IllegalArgumentException - if inconsistent arguments are given (parameters out of range)
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         int year,
                         Month month,
                         int day,
                         TimeScale timeScale)
                  throws IllegalArgumentException
```
    Build an instance from a location in a time scale.
    The hour is set to 00:00:00.000.
    
    Parameters:
    
    field - field utilized by default
    
    year - year number (may be 0 or negative for BC years)
    
    month - month enumerate
    
    day - day number from 1 to 31
    
    timeScale - time scale
    
    Throws:
    
    IllegalArgumentException - if inconsistent arguments are given (parameters out of range)
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         Date location,
                         TimeScale timeScale)
```
    Build an instance from a location in a time scale.
    
    Parameters:
    
    field - field utilized as default
    
    location - location in the time scale
    
    timeScale - time scale
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         Instant instant,
                         TimeScale timeScale)
```
    Build an instance from an instant in a time scale.
    
    Parameters:
    
    field - field utilized as default
    
    instant - instant in the time scale
    
    timeScale - time scale
    
    Since:
    
    12.0
  - FieldAbsoluteDate
```
@DefaultDataContext
public FieldAbsoluteDate(Field<T> field,
                         Instant instant)
```
    Build an instance from an instant in utc time scale.
    
    Parameters:
    
    field - field utilized as default
    
    instant - instant in the utc timescale
    
    Since:
    
    12.1
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(Field<T> field,
                         Instant instant,
                         UTCScale utcScale)
```
    Build an instance from an instant in the time scale.
    
    Parameters:
    
    field - field utilized as default
    
    instant - instant in the time scale
    
    utcScale - utc time scale
    
    Since:
    
    12.1
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(FieldAbsoluteDate<T> since,
                         double elapsedDuration)
```
    Build an instance from an elapsed duration since to another instant.
    It is important to note that the elapsed duration is not the difference between two readings on a time scale.
    
    Parameters:
    
    since - start instant of the measured duration
    
    elapsedDuration - physically elapsed duration from the since instant, as measured in a regular time scale
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(FieldAbsoluteDate<T> since,
                         long elapsedDuration,
                         TimeUnit timeUnit)
```
    Build an instance from an elapsed duration since to another instant.
    It is important to note that the elapsed duration is not the difference between two readings on a time scale.
    
    Parameters:
    
    since - start instant of the measured duration
    
    elapsedDuration - physically elapsed duration from the since instant, as measured in a regular time scale
    
    timeUnit - TimeUnit of the elapsed duration
    
    Since:
    
    12.1
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(AbsoluteDate since,
                         T elapsedDuration)
```
    Build an instance from an elapsed duration since to another instant.
    It is important to note that the elapsed duration is not the difference between two readings on a time scale.
    
    Parameters:
    
    since - start instant of the measured duration
    
    elapsedDuration - physically elapsed duration from the since instant, as measured in a regular time scale
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(AbsoluteDate since,
                         long elapsedDuration,
                         TimeUnit timeUnit,
                         Field<T> field)
```
    Build an instance from an elapsed duration since to another instant.
    It is important to note that the elapsed duration is not the difference between two readings on a time scale.
    
    Parameters:
    
    since - start instant of the measured duration
    
    elapsedDuration - physically elapsed duration from the since instant, as measured in a regular time scale
    
    timeUnit - TimeUnit of the elapsed duration
    
    field - field utilized by default
    
    Since:
    
    12.1
  - FieldAbsoluteDate
```
public FieldAbsoluteDate(FieldAbsoluteDate<T> reference,
                         double apparentOffset,
                         TimeScale timeScale)
```
    Build an instance from an apparent clock offset with respect to another instant in the perspective of a specific time scale.
    It is important to note that the apparent clock offset is the difference between two readings on a time scale and not an elapsed duration. As an example, the apparent clock offset between the two instants leading to the readings 2005-12-31T23:59:59 and 2006-01-01T00:00:00 in the UTC time scale is 1 second, but the elapsed duration is 2 seconds because a leap second has been introduced at the end of 2005 in this time scale.
    
    This constructor is the reverse of the offsetFrom(FieldAbsoluteDate, TimeScale) method.
    
    Parameters:
    
    reference - reference instant
    
    apparentOffset - apparent clock offset from the reference instant (difference between two readings in the specified time scale)
    
    timeScale - time scale with respect to which the offset is defined
    
    See Also:
    
    offsetFrom(FieldAbsoluteDate, TimeScale)
- Method Detail
  - parseCCSDSUnsegmentedTimeCode
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> parseCCSDSUnsegmentedTimeCode(Field<T> field,
                                                                                                     byte preambleField1,
                                                                                                     byte preambleField2,
                                                                                                     byte[] timeField,
                                                                                                     FieldAbsoluteDate<T> agencyDefinedEpoch)
```
    Build an instance from a CCSDS Unsegmented Time Code (CUC).
    CCSDS Unsegmented Time Code is defined in the blue book: CCSDS Time Code Format (CCSDS 301.0-B-4) published in November 2010
    
    If the date to be parsed is formatted using version 3 of the standard (CCSDS 301.0-B-3 published in 2002) or if the extension of the preamble field introduced in version 4 of the standard is not used, then the preambleField2 parameter can be set to 0.
    
    This method uses the default data context if the CCSDS epoch is used.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    preambleField1 - first byte of the field specifying the format, often not transmitted in data interfaces, as it is constant for a given data interface
    
    preambleField2 - second byte of the field specifying the format (added in revision 4 of the CCSDS standard in 2010), often not transmitted in data interfaces, as it is constant for a given data interface (value ignored if presence not signaled in preambleField1)
    
    timeField - byte array containing the time code
    
    agencyDefinedEpoch - reference epoch, ignored if the preamble field specifies the CCSDS reference epoch is used (and hence may be null in this case)
    
    Returns:
    
    an instance corresponding to the specified date
    
    See Also:
    
    parseCCSDSUnsegmentedTimeCode(Field, byte, byte, byte[], FieldAbsoluteDate, FieldAbsoluteDate)
  - parseCCSDSUnsegmentedTimeCode
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> parseCCSDSUnsegmentedTimeCode(Field<T> field,
                                                                                                     byte preambleField1,
                                                                                                     byte preambleField2,
                                                                                                     byte[] timeField,
                                                                                                     FieldAbsoluteDate<T> agencyDefinedEpoch,
                                                                                                     FieldAbsoluteDate<T> ccsdsEpoch)
```
    Build an instance from a CCSDS Unsegmented Time Code (CUC).
    CCSDS Unsegmented Time Code is defined in the blue book: CCSDS Time Code Format (CCSDS 301.0-B-4) published in November 2010
    
    If the date to be parsed is formatted using version 3 of the standard (CCSDS 301.0-B-3 published in 2002) or if the extension of the preamble field introduced in version 4 of the standard is not used, then the preambleField2 parameter can be set to 0.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    preambleField1 - first byte of the field specifying the format, often not transmitted in data interfaces, as it is constant for a given data interface
    
    preambleField2 - second byte of the field specifying the format (added in revision 4 of the CCSDS standard in 2010), often not transmitted in data interfaces, as it is constant for a given data interface (value ignored if presence not signaled in preambleField1)
    
    timeField - byte array containing the time code
    
    agencyDefinedEpoch - reference epoch, ignored if the preamble field specifies the CCSDS reference epoch is used (and hence may be null in this case)
    
    ccsdsEpoch - reference epoch, ignored if the preamble field specifies the agency epoch is used.
    
    Returns:
    
    an instance corresponding to the specified date
    
    Since:
    
    10.1
  - parseCCSDSDaySegmentedTimeCode
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> parseCCSDSDaySegmentedTimeCode(Field<T> field,
                                                                                                      byte preambleField,
                                                                                                      byte[] timeField,
                                                                                                      DateComponents agencyDefinedEpoch)
```
    Build an instance from a CCSDS Day Segmented Time Code (CDS).
    CCSDS Day Segmented Time Code is defined in the blue book: CCSDS Time Code Format (CCSDS 301.0-B-4) published in November 2010
    
    This method uses the default data context.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    preambleField - field specifying the format, often not transmitted in data interfaces, as it is constant for a given data interface
    
    timeField - byte array containing the time code
    
    agencyDefinedEpoch - reference epoch, ignored if the preamble field specifies the CCSDS reference epoch is used (and hence may be null in this case)
    
    Returns:
    
    an instance corresponding to the specified date
    
    See Also:
    
    parseCCSDSDaySegmentedTimeCode(Field, byte, byte[], DateComponents, TimeScale)
  - parseCCSDSDaySegmentedTimeCode
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> parseCCSDSDaySegmentedTimeCode(Field<T> field,
                                                                                                      byte preambleField,
                                                                                                      byte[] timeField,
                                                                                                      DateComponents agencyDefinedEpoch,
                                                                                                      TimeScale utc)
```
    Build an instance from a CCSDS Day Segmented Time Code (CDS).
    CCSDS Day Segmented Time Code is defined in the blue book: CCSDS Time Code Format (CCSDS 301.0-B-4) published in November 2010
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    preambleField - field specifying the format, often not transmitted in data interfaces, as it is constant for a given data interface
    
    timeField - byte array containing the time code
    
    agencyDefinedEpoch - reference epoch, ignored if the preamble field specifies the CCSDS reference epoch is used (and hence may be null in this case)
    
    utc - time scale used to compute date and time components.
    
    Returns:
    
    an instance corresponding to the specified date
    
    Since:
    
    10.1
  - parseCCSDSCalendarSegmentedTimeCode
```
@DefaultDataContext
public FieldAbsoluteDate<T> parseCCSDSCalendarSegmentedTimeCode(byte preambleField,
                                                                byte[] timeField)
```
    Build an instance from a CCSDS Calendar Segmented Time Code (CCS).
    CCSDS Calendar Segmented Time Code is defined in the blue book: CCSDS Time Code Format (CCSDS 301.0-B-4) published in November 2010
    
    This method uses the default data context.
    
    Parameters:
    
    preambleField - field specifying the format, often not transmitted in data interfaces, as it is constant for a given data interface
    
    timeField - byte array containing the time code
    
    Returns:
    
    an instance corresponding to the specified date
    
    See Also:
    
    parseCCSDSCalendarSegmentedTimeCode(byte, byte[], TimeScale)
  - parseCCSDSCalendarSegmentedTimeCode
```
public FieldAbsoluteDate<T> parseCCSDSCalendarSegmentedTimeCode(byte preambleField,
                                                                byte[] timeField,
                                                                TimeScale utc)
```
    Build an instance from a CCSDS Calendar Segmented Time Code (CCS).
    CCSDS Calendar Segmented Time Code is defined in the blue book: CCSDS Time Code Format (CCSDS 301.0-B-4) published in November 2010
    
    Parameters:
    
    preambleField - field specifying the format, often not transmitted in data interfaces, as it is constant for a given data interface
    
    timeField - byte array containing the time code
    
    utc - time scale used to compute date and time components.
    
    Returns:
    
    an instance corresponding to the specified date
    
    Since:
    
    10.1
  - createJDDate
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> createJDDate(int jd,
                                                                                    T secondsSinceNoon,
                                                                                    TimeScale timeScale)
```
    Build an instance corresponding to a Julian Day date.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    jd - Julian day
    
    secondsSinceNoon - seconds in the Julian day (BEWARE, Julian days start at noon, so 0.0 is noon)
    
    timeScale - time scale in which the seconds in day are defined
    
    Returns:
    
    a new instant
  - createJDDate
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> createJDDate(int jd,
                                                                                    T secondsSinceNoon,
                                                                                    TimeScale timeScale,
                                                                                    TimeScale pivotTimeScale)
```
    Build an instance corresponding to a Julian Day date.
    This function should be preferred to createJDDate(int, CalculusFieldElement, TimeScale) when the target time scale has a non-constant offset with respect to TAI.
    The idea is to introduce a pivot time scale that is close to the target time scale but has a constant bias with TAI.
    For example, to get a date from an MJD in TDB time scale, it's advised to use the TT time scale as a pivot scale. TT is very close to TDB and has constant offset to TAI.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    jd - Julian day
    
    secondsSinceNoon - seconds in the Julian day (BEWARE, Julian days start at noon, so 0.0 is noon)
    
    timeScale - time scale in which the seconds in day are defined
    
    pivotTimeScale - pivot timescale used as intermediate timescale
    
    Returns:
    
    a new instant
  - createMJDDate
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> createMJDDate(int mjd,
                                                                                     T secondsInDay,
                                                                                     TimeScale timeScale)
```
    Build an instance corresponding to a Modified Julian Day date.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    mjd - modified Julian day
    
    secondsInDay - seconds in the day
    
    timeScale - time scale in which the seconds in day are defined
    
    Returns:
    
    a new instant
  - createGPSDate
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> createGPSDate(int weekNumber,
                                                                                     T milliInWeek)
```
    Build an instance corresponding to a GPS date.
    This method uses the default data context.
    GPS dates are provided as a week number starting at GPS epoch and as a number of milliseconds since week start.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    weekNumber - week number since GPS epoch
    
    milliInWeek - number of milliseconds since week start
    
    Returns:
    
    a new instant
    
    See Also:
    
    createGPSDate(int, CalculusFieldElement, TimeScale)
  - createGPSDate
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> createGPSDate(int weekNumber,
                                                                                     T milliInWeek,
                                                                                     TimeScale gps)
```
    Build an instance corresponding to a GPS date.
    GPS dates are provided as a week number starting at GPS epoch and as a number of milliseconds since week start.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    weekNumber - week number since GPS epoch
    
    milliInWeek - number of milliseconds since week start
    
    gps - GPS time scale.
    
    Returns:
    
    a new instant
    
    Since:
    
    10.1
  - createJulianEpoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> createJulianEpoch(T julianEpoch)
```
    Build an instance corresponding to a Julian Epoch (JE).
    According to Lieske paper: Precession Matrix Based on IAU (1976) System of Astronomical Constants, Astronomy and Astrophysics, vol. 73, no. 3, Mar. 1979, p. 282-284, Julian Epoch is related to Julian Ephemeris Date as:
    JE = 2000.0 + (JED - 2451545.0) / 365.25
    
    This method reverts the formula above and computes an FieldAbsoluteDate<T> from the Julian Epoch.
    This method uses the default data context.
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    julianEpoch - Julian epoch, like 2000.0 for defining the classical reference J2000.0
    
    Returns:
    
    a new instant
    
    See Also:
    
    getJ2000Epoch(Field), createBesselianEpoch(CalculusFieldElement), createJulianEpoch(CalculusFieldElement, TimeScales)
  - createJulianEpoch
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> createJulianEpoch(T julianEpoch,
                                                                                         TimeScales timeScales)
```
    Build an instance corresponding to a Julian Epoch (JE).
    According to Lieske paper: Precession Matrix Based on IAU (1976) System of Astronomical Constants, Astronomy and Astrophysics, vol. 73, no. 3, Mar. 1979, p. 282-284, Julian Epoch is related to Julian Ephemeris Date as:
    JE = 2000.0 + (JED - 2451545.0) / 365.25
    
    This method reverts the formula above and computes an FieldAbsoluteDate<T> from the Julian Epoch.
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    julianEpoch - Julian epoch, like 2000.0 for defining the classical reference J2000.0
    
    timeScales - used in the computation.
    
    Returns:
    
    a new instant
    
    Since:
    
    10.1
    
    See Also:
    
    getJ2000Epoch(Field), createBesselianEpoch(CalculusFieldElement), TimeScales.createJulianEpoch(double)
  - createBesselianEpoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> createBesselianEpoch(T besselianEpoch)
```
    Build an instance corresponding to a Besselian Epoch (BE).
    According to Lieske paper: Precession Matrix Based on IAU (1976) System of Astronomical Constants, Astronomy and Astrophysics, vol. 73, no. 3, Mar. 1979, p. 282-284, Besselian Epoch is related to Julian Ephemeris Date as:
    
    BE = 1900.0 + (JED - 2415020.31352) / 365.242198781
    
    This method reverts the formula above and computes an FieldAbsoluteDate<T> from the Besselian Epoch.
    
    This method uses the default data context.
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    besselianEpoch - Besselian epoch, like 1950 for defining the classical reference B1950.0
    
    Returns:
    
    a new instant
    
    See Also:
    
    createJulianEpoch(CalculusFieldElement), createBesselianEpoch(CalculusFieldElement, TimeScales)
  - createBesselianEpoch
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> createBesselianEpoch(T besselianEpoch,
                                                                                            TimeScales timeScales)
```
    Build an instance corresponding to a Besselian Epoch (BE).
    According to Lieske paper: Precession Matrix Based on IAU (1976) System of Astronomical Constants, Astronomy and Astrophysics, vol. 73, no. 3, Mar. 1979, p. 282-284, Besselian Epoch is related to Julian Ephemeris Date as:
    
    BE = 1900.0 + (JED - 2415020.31352) / 365.242198781
    
    This method reverts the formula above and computes an FieldAbsoluteDate<T> from the Besselian Epoch.
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    besselianEpoch - Besselian epoch, like 1950 for defining the classical reference B1950.0
    
    timeScales - used in the computation.
    
    Returns:
    
    a new instant
    
    Since:
    
    10.1
    
    See Also:
    
    createJulianEpoch(CalculusFieldElement), TimeScales.createBesselianEpoch(double)
  - getJulianEpoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getJulianEpoch(Field<T> field)
```
    Reference epoch for julian dates: -4712-01-01T12:00:00 Terrestrial Time.
    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).
    
    This method uses the default data context.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    the reference epoch for julian dates as a FieldAbsoluteDate
    
    See Also:
    
    AbsoluteDate.JULIAN_EPOCH, TimeScales.getJulianEpoch()
  - getModifiedJulianEpoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getModifiedJulianEpoch(Field<T> field)
```
    Reference epoch for modified julian dates: 1858-11-17T00:00:00 Terrestrial Time.
    This method uses the default data context.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    the reference epoch for modified julian dates as a FieldAbsoluteDate
    
    See Also:
    
    AbsoluteDate.MODIFIED_JULIAN_EPOCH, TimeScales.getModifiedJulianEpoch()
  - getFiftiesEpoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getFiftiesEpoch(Field<T> field)
```
    Reference epoch for 1950 dates: 1950-01-01T00:00:00 Terrestrial Time.
    This method uses the default data context.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    the reference epoch for 1950 dates as a FieldAbsoluteDate
    
    See Also:
    
    AbsoluteDate.FIFTIES_EPOCH, TimeScales.getFiftiesEpoch()
  - getCCSDSEpoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getCCSDSEpoch(Field<T> field)
```
    Reference epoch for CCSDS Time Code Format (CCSDS 301.0-B-4).
    This method uses the default data context.
    1958-01-01T00:00:00 International Atomic Time (not UTC).
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    the reference epoch for CCSDS Time Code Format as a FieldAbsoluteDate
    
    See Also:
    
    AbsoluteDate.CCSDS_EPOCH, TimeScales.getCcsdsEpoch()
  - getGalileoEpoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getGalileoEpoch(Field<T> field)
```
    Reference epoch for Galileo System Time: 1999-08-22T00:00:00 UTC.
    This method uses the default data context.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    the reference epoch for Galileo System Time as a FieldAbsoluteDate
    
    See Also:
    
    AbsoluteDate.GALILEO_EPOCH, TimeScales.getGalileoEpoch()
  - getGPSEpoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getGPSEpoch(Field<T> field)
```
    Reference epoch for GPS weeks: 1980-01-06T00:00:00 GPS time.
    This method uses the default data context.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    the reference epoch for GPS weeks as a FieldAbsoluteDate
    
    See Also:
    
    AbsoluteDate.GPS_EPOCH, TimeScales.getGpsEpoch()
  - getJ2000Epoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getJ2000Epoch(Field<T> field)
```
    J2000.0 Reference epoch: 2000-01-01T12:00:00 Terrestrial Time (not UTC).
    This method uses the default data context.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    the J2000.0 reference epoch as a FieldAbsoluteDate
    
    See Also:
    
    createJulianEpoch(CalculusFieldElement), AbsoluteDate.J2000_EPOCH, TimeScales.getJ2000Epoch()
  - getJavaEpoch
```
@DefaultDataContext
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getJavaEpoch(Field<T> field)
```
    Java Reference epoch: 1970-01-01T00:00:00 Universal Time Coordinate.
    This method uses the default data context.
    Between 1968-02-01 and 1972-01-01, UTC-TAI = 4.213 170 0s + (MJD - 39 126) x 0.002 592s. As on 1970-01-01 MJD = 40587, UTC-TAI = 8.000082s
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    the Java reference epoch as a FieldAbsoluteDate
    
    See Also:
    
    AbsoluteDate.JAVA_EPOCH, TimeScales.getJavaEpoch()
  - getPastInfinity
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getPastInfinity(Field<T> field)
```
    Dummy date at infinity in the past direction.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    a dummy date at infinity in the past direction as a FieldAbsoluteDate
    
    See Also:
    
    AbsoluteDate.PAST_INFINITY, TimeScales.getPastInfinity()
  - getFutureInfinity
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getFutureInfinity(Field<T> field)
```
    Dummy date at infinity in the future direction.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    a dummy date at infinity in the future direction as a FieldAbsoluteDate
    
    See Also:
    
    AbsoluteDate.FUTURE_INFINITY, TimeScales.getFutureInfinity()
  - getArbitraryEpoch
```
public static <T extends CalculusFieldElement<T>> FieldAbsoluteDate<T> getArbitraryEpoch(Field<T> field)
```
    Get an arbitrary date. Useful when a non-null date is needed but its values does not matter.
    
    Type Parameters:
    
    T - the type of the field elements
    
    Parameters:
    
    field - field for the components
    
    Returns:
    
    an arbitrary date.
  - shiftedBy
```
public FieldAbsoluteDate<T> shiftedBy(T dt)
```
    Get a time-shifted date.
    Calling this method is equivalent to call new FieldAbsoluteDate<>(this, dt).
    
    Specified by:
    
    shiftedBy in interface FieldTimeShiftable<FieldAbsoluteDate<T extends CalculusFieldElement<T>>,T extends CalculusFieldElement<T>>
    
    Parameters:
    
    dt - time shift in seconds
    
    Returns:
    
    a new date, shifted with respect to instance (which is immutable)
    
    See Also:
    
    FieldPVCoordinates.shiftedBy(double), FieldAttitude.shiftedBy(double), TimeShiftable.shiftedBy(double), FieldSpacecraftState.shiftedBy(double)
  - durationFrom
```
public T durationFrom(FieldAbsoluteDate<T> instant)
```
    Compute the physically elapsed duration between two instants.
    The returned duration is the number of seconds physically elapsed between the two instants, measured in a regular time scale with respect to surface of the Earth (i.e either the TAI scale, the TT scale or the GPS scale). It is the only method that gives a duration with a physical meaning.
    
    This method gives the same result (with less computation) as calling offsetFrom(FieldAbsoluteDate, TimeScale) with a second argument set to one of the regular scales cited above.
    
    This method is the reverse of the FieldAbsoluteDate(FieldAbsoluteDate, double) constructor.
    
    Parameters:
    
    instant - instant to subtract from the instance
    
    Returns:
    
    offset in seconds between the two instants (positive if the instance is posterior to the argument)
    
    See Also:
    
    offsetFrom(FieldAbsoluteDate, TimeScale), FieldAbsoluteDate(FieldAbsoluteDate, double)
  - durationFrom
```
public T durationFrom(FieldAbsoluteDate<T> instant,
                      TimeUnit timeUnit)
```
    Compute the physically elapsed duration between two instants.
    The returned duration is the number of seconds physically elapsed between the two instants, measured in a regular time scale with respect to surface of the Earth (i.e either the TAI scale, the TT scale or the GPS scale). It is the only method that gives a duration with a physical meaning.
    
    This method gives the same result (with less computation) as calling offsetFrom(FieldAbsoluteDate, TimeScale) with a second argument set to one of the regular scales cited above.
    
    This method is the reverse of the FieldAbsoluteDate(FieldAbsoluteDate, double) constructor.
    
    Parameters:
    
    instant - instant to subtract from the instance
    
    timeUnit - TimeUnit precision for the offset
    
    Returns:
    
    offset in seconds between the two instants (positive if the instance is posterior to the argument)
    
    See Also:
    
    offsetFrom(FieldAbsoluteDate, TimeScale), FieldAbsoluteDate(FieldAbsoluteDate, double)
  - durationFrom
```
public T durationFrom(AbsoluteDate instant)
```
    Compute the physically elapsed duration between two instants.
    The returned duration is the number of seconds physically elapsed between the two instants, measured in a regular time scale with respect to surface of the Earth (i.e either the TAI scale, the TT scale or the GPS scale). It is the only method that gives a duration with a physical meaning.
    
    This method gives the same result (with less computation) as calling offsetFrom(FieldAbsoluteDate, TimeScale) with a second argument set to one of the regular scales cited above.
    
    This method is the reverse of the FieldAbsoluteDate(FieldAbsoluteDate, double) constructor.
    
    Parameters:
    
    instant - instant to subtract from the instance
    
    Returns:
    
    offset in seconds between the two instants (positive if the instance is posterior to the argument)
    
    See Also:
    
    offsetFrom(FieldAbsoluteDate, TimeScale), FieldAbsoluteDate(FieldAbsoluteDate, double)
  - durationFrom
```
public T durationFrom(AbsoluteDate instant,
                      TimeUnit timeUnit)
```
    Compute the physically elapsed duration between two instants.
    The returned duration is the number of seconds physically elapsed between the two instants, measured in a regular time scale with respect to surface of the Earth (i.e either the TAI scale, the TT scale or the GPS scale). It is the only method that gives a duration with a physical meaning.
    
    This method gives the same result (with less computation) as calling offsetFrom(FieldAbsoluteDate, TimeScale) with a second argument set to one of the regular scales cited above.
    
    This method is the reverse of the FieldAbsoluteDate(FieldAbsoluteDate, double) constructor.
    
    Parameters:
    
    instant - instant to subtract from the instance
    
    timeUnit - TimeUnit precision for the offset
    
    Returns:
    
    offset in the given timeunit between the two instants (positive if the instance is posterior to the argument), rounded to the nearest integer TimeUnit
    
    Since:
    
    12.1
    
    See Also:
    
    FieldAbsoluteDate(FieldAbsoluteDate, long, TimeUnit)
  - offsetFrom
```
public T offsetFrom(FieldAbsoluteDate<T> instant,
                    TimeScale timeScale)
```
    Compute the apparent clock offset between two instant in the perspective of a specific time scale.
    The offset is the number of seconds counted in the given time scale between the locations of the two instants, with all time scale irregularities removed (i.e. considering all days are exactly 86400 seconds long). This method will give a result that may not have a physical meaning if the time scale is irregular. For example since a leap second was introduced at the end of 2005, the apparent offset between 2005-12-31T23:59:59 and 2006-01-01T00:00:00 is 1 second, but the physical duration of the corresponding time interval as returned by the durationFrom(FieldAbsoluteDate) method is 2 seconds.
    
    This method is the reverse of the FieldAbsoluteDate(FieldAbsoluteDate, double, TimeScale) constructor.
    
    Parameters:
    
    instant - instant to subtract from the instance
    
    timeScale - time scale with respect to which the offset should be computed
    
    Returns:
    
    apparent clock offset in seconds between the two instants (positive if the instance is posterior to the argument)
    
    See Also:
    
    durationFrom(FieldAbsoluteDate), FieldAbsoluteDate(FieldAbsoluteDate, double, TimeScale)
  - timeScalesOffset
```
public T timeScalesOffset(TimeScale scale1,
                          TimeScale scale2)
```
    Compute the offset between two time scales at the current instant.
    The offset is defined as l₁-l₂ where l₁ is the location of the instant in the scale1 time scale and l₂ is the location of the instant in the scale2 time scale.
    
    Parameters:
    
    scale1 - first time scale
    
    scale2 - second time scale
    
    Returns:
    
    offset in seconds between the two time scales at the current instant
  - toDate
```
public Date toDate(TimeScale timeScale)
```
    Convert the instance to a Java Date.
    Conversion to the Date class induces a loss of precision because the Date class does not provide sub-millisecond information. Java Dates are considered to be locations in some times scales.
    
    Parameters:
    
    timeScale - time scale to use
    
    Returns:
    
    a Date instance representing the location of the instant in the time scale
  - toInstant
```
@DefaultDataContext
public Instant toInstant()
```
    Convert the instance to a Java Instant. Nanosecond precision is preserved during this conversion
    
    Returns:
    
    a Instant instance representing the location of the instant in the utc time scale
    
    Since:
    
    12.1
  - toInstant
```
public Instant toInstant(TimeScales timeScales)
```
    Convert the instance to a Java Instant. Nanosecond precision is preserved during this conversion
    
    Parameters:
    
    timeScales - the timescales to use
    
    Returns:
    
    a Instant instance representing the location of the instant in the utc time scale
    
    Since:
    
    12.1
  - getComponents
```
public DateTimeComponents getComponents(TimeScale timeScale)
```
    Split the instance into date/time components.
    
    Parameters:
    
    timeScale - time scale to use
    
    Returns:
    
    date/time components
  - getComponents
```
@DefaultDataContext
public DateTimeComponents getComponents(int minutesFromUTC)
```
    Split the instance into date/time components for a local time.
    This method uses the default data context.
    
    Parameters:
    
    minutesFromUTC - offset in minutes from UTC (positive Eastwards UTC, negative Westward UTC)
    
    Returns:
    
    date/time components
    
    See Also:
    
    getComponents(int, TimeScale)
  - getComponents
```
public DateTimeComponents getComponents(int minutesFromUTC,
                                        TimeScale utc)
```
    Split the instance into date/time components for a local time.
    
    Parameters:
    
    minutesFromUTC - offset in minutes from UTC (positive Eastwards UTC, negative Westward UTC)
    
    utc - time scale used to compute date and time components.
    
    Returns:
    
    date/time components
    
    Since:
    
    10.1
  - getDate
```
public FieldAbsoluteDate<T> getDate()
```
    Get the date.
    
    Specified by:
    
    getDate in interface FieldTimeStamped<T extends CalculusFieldElement<T>>
    
    Returns:
    
    date attached to the object
  - getField
```
public Field<T> getField()
```
    Get the field.
    
    Returns:
    
    field instance.
  - getComponents
```
@DefaultDataContext
public DateTimeComponents getComponents(TimeZone timeZone)
```
    Split the instance into date/time components for a time zone.
    This method uses the default data context.
    
    Parameters:
    
    timeZone - time zone
    
    Returns:
    
    date/time components
    
    See Also:
    
    getComponents(TimeZone, TimeScale)
  - getComponents
```
public DateTimeComponents getComponents(TimeZone timeZone,
                                        TimeScale utc)
```
    Split the instance into date/time components for a time zone.
    
    Parameters:
    
    timeZone - time zone
    
    utc - time scale used to compute date and time components.
    
    Returns:
    
    date/time components
    
    Since:
    
    10.1
  - compareTo
```
public int compareTo(FieldAbsoluteDate<T> date)
```
    Compare the instance with another date.
    
    Specified by:
    
    compareTo in interface Comparable<T extends CalculusFieldElement<T>>
    
    Parameters:
    
    date - other date to compare the instance to
    
    Returns:
    
    a negative integer, zero, or a positive integer as this date is before, simultaneous, or after the specified date.
  - equals
```
public boolean equals(Object date)
```
    Check if the instance represents the same time as another instance.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    date - other date
    
    Returns:
    
    true if the instance and the other date refer to the same instant
  - isEqualTo
```
public boolean isEqualTo(FieldTimeStamped<T> other)
```
    Check if the instance represents the same time as another.
    
    Parameters:
    
    other - the instant to compare this date to
    
    Returns:
    
    true if the instance and the argument refer to the same instant
    
    Since:
    
    10.1
    
    See Also:
    
    isCloseTo(FieldTimeStamped, double)
  - isCloseTo
```
public boolean isCloseTo(FieldTimeStamped<T> other,
                         double tolerance)
```
    Check if the instance time is close to another.
    
    Parameters:
    
    other - the instant to compare this date to
    
    tolerance - the separation, in seconds, under which the two instants will be considered close to each other
    
    Returns:
    
    true if the duration between the instance and the argument is strictly below the tolerance
    
    Since:
    
    10.1
    
    See Also:
    
    isEqualTo(FieldTimeStamped)
  - isBefore
```
public boolean isBefore(FieldTimeStamped<T> other)
```
    Check if the instance represents a time that is strictly before another.
    
    Parameters:
    
    other - the instant to compare this date to
    
    Returns:
    
    true if the instance is strictly before the argument when ordering chronologically
    
    Since:
    
    10.1
    
    See Also:
    
    isBeforeOrEqualTo(FieldTimeStamped)
  - isAfter
```
public boolean isAfter(FieldTimeStamped<T> other)
```
    Check if the instance represents a time that is strictly after another.
    
    Parameters:
    
    other - the instant to compare this date to
    
    Returns:
    
    true if the instance is strictly after the argument when ordering chronologically
    
    Since:
    
    10.1
    
    See Also:
    
    isAfterOrEqualTo(FieldTimeStamped)
  - isBeforeOrEqualTo
```
public boolean isBeforeOrEqualTo(FieldTimeStamped<T> other)
```
    Check if the instance represents a time that is before or equal to another.
    
    Parameters:
    
    other - the instant to compare this date to
    
    Returns:
    
    true if the instance is before (or equal to) the argument when ordering chronologically
    
    Since:
    
    10.1
    
    See Also:
    
    isBefore(FieldTimeStamped)
  - isAfterOrEqualTo
```
public boolean isAfterOrEqualTo(FieldTimeStamped<T> other)
```
    Check if the instance represents a time that is after or equal to another.
    
    Parameters:
    
    other - the instant to compare this date to
    
    Returns:
    
    true if the instance is after (or equal to) the argument when ordering chronologically
    
    Since:
    
    10.1
    
    See Also:
    
    isAfterOrEqualTo(FieldTimeStamped)
  - isBetween
```
public boolean isBetween(FieldTimeStamped<T> boundary,
                         FieldTimeStamped<T> otherBoundary)
```
    Check if the instance represents a time that is strictly between two others representing the boundaries of a time span. The two boundaries can be provided in any order: in other words, whether boundary represents a time that is before or after otherBoundary will not change the result of this method.
    
    Parameters:
    
    boundary - one end of the time span
    
    otherBoundary - the other end of the time span
    
    Returns:
    
    true if the instance is strictly between the two arguments when ordering chronologically
    
    Since:
    
    10.1
    
    See Also:
    
    isBetweenOrEqualTo(FieldTimeStamped, FieldTimeStamped)
  - isBetweenOrEqualTo
```
public boolean isBetweenOrEqualTo(FieldTimeStamped<T> boundary,
                                  FieldTimeStamped<T> otherBoundary)
```
    Check if the instance represents a time that is between two others representing the boundaries of a time span, or equal to one of them. The two boundaries can be provided in any order: in other words, whether boundary represents a time that is before or after otherBoundary will not change the result of this method.
    
    Parameters:
    
    boundary - one end of the time span
    
    otherBoundary - the other end of the time span
    
    Returns:
    
    true if the instance is between the two arguments (or equal to at least one of them) when ordering chronologically
    
    Since:
    
    10.1
    
    See Also:
    
    isBetween(FieldTimeStamped, FieldTimeStamped)
  - hashCode
```
public int hashCode()
```
    Get a hashcode for this date.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    hashcode
  - toString
```
@DefaultDataContext
public String toString()
```
    Get a String representation of the instant location with up to 16 digits of precision for the seconds value.
    Since this method is used in exception messages and error handling every effort is made to return some representation of the instant. If UTC is available from the default data context then it is used to format the string in UTC. If not then TAI is used. Finally if the prior attempts fail this method falls back to converting this class's internal representation to a string.
    This method uses the default data context.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a string representation of the instance, in ISO-8601 format if UTC is available from the default data context.
    
    See Also:
    
    AbsoluteDate.toString(), toString(TimeScale), DateTimeComponents.toString(int, int)
  - toString
```
public String toString(TimeScale timeScale)
```
    Get a String representation of the instant location in ISO-8601 format without the UTC offset and with up to 16 digits of precision for the seconds value.
    
    Parameters:
    
    timeScale - time scale to use
    
    Returns:
    
    a string representation of the instance.
    
    See Also:
    
    DateTimeComponents.toString(int, int)
  - toString
```
@DefaultDataContext
public String toString(int minutesFromUTC)
```
    Get a String representation of the instant location for a local time.
    This method uses the default data context.
    
    Parameters:
    
    minutesFromUTC - offset in minutes from UTC (positive Eastwards UTC, negative Westward UTC).
    
    Returns:
    
    string representation of the instance, in ISO-8601 format with milliseconds accuracy
    
    See Also:
    
    toString(int, TimeScale)
  - toString
```
public String toString(int minutesFromUTC,
                       TimeScale utc)
```
    Get a String representation of the instant location for a local time.
    
    Parameters:
    
    minutesFromUTC - offset in minutes from UTC (positive Eastwards UTC, negative Westward UTC).
    
    utc - time scale used to compute date and time components.
    
    Returns:
    
    string representation of the instance, in ISO-8601 format with milliseconds accuracy
    
    Since:
    
    10.1
  - toString
```
@DefaultDataContext
public String toString(TimeZone timeZone)
```
    Get a String representation of the instant location for a time zone.
    This method uses the default data context.
    
    Parameters:
    
    timeZone - time zone
    
    Returns:
    
    string representation of the instance, in ISO-8601 format with milliseconds accuracy
    
    See Also:
    
    toString(TimeZone, TimeScale)
  - toString
```
public String toString(TimeZone timeZone,
                       TimeScale utc)
```
    Get a String representation of the instant location for a time zone.
    
    Parameters:
    
    timeZone - time zone
    
    utc - time scale used to compute date and time components.
    
    Returns:
    
    string representation of the instance, in ISO-8601 format with milliseconds accuracy
    
    Since:
    
    10.1
  - toStringWithoutUtcOffset
```
public String toStringWithoutUtcOffset(TimeScale timeScale,
                                       int fractionDigits)
```
    Return a string representation of this date-time, rounded to the given precision.
    The format used is ISO8601 without the UTC offset.
    
    Parameters:
    
    timeScale - to use to compute components.
    
    fractionDigits - the number of digits to include after the decimal point in the string representation of the seconds. The date and time is first rounded as necessary. fractionDigits must be greater than or equal to 0.
    
    Returns:
    
    string representation of this date, time, and UTC offset
    
    Since:
    
    12.2
    
    See Also:
    
    toString(TimeScale), DateTimeComponents.toString(int, int), DateTimeComponents.toStringWithoutUtcOffset(int, int)
  - shiftedBy
```
public FieldAbsoluteDate<T> shiftedBy(double dt)
```
    Get a time-shifted date.
    Calling this method is equivalent to call new FieldAbsoluteDate(this, dt).
    
    Specified by:
    
    shiftedBy in interface TimeShiftable<T extends CalculusFieldElement<T>>
    
    Parameters:
    
    dt - time shift in seconds
    
    Returns:
    
    a new date, shifted with respect to instance (which is immutable)
    
    See Also:
    
    FieldPVCoordinates.shiftedBy(double), FieldAttitude.shiftedBy(double), TimeShiftable.shiftedBy(double), FieldSpacecraftState.shiftedBy(double)
  - shiftedBy
```
public FieldAbsoluteDate<T> shiftedBy(long dt,
                                      TimeUnit timeUnit)
```
    Get a time-shifted date.
    Calling this method is equivalent to call new FieldAbsoluteDate(this, dt, timeUnit).
    
    Parameters:
    
    dt - time shift in time units
    
    timeUnit - TimeUnit for dt
    
    Returns:
    
    a new date, shifted with respect to instance (which is immutable)
    
    Since:
    
    12.1
    
    See Also:
    
    FieldPVCoordinates.shiftedBy(double), FieldAttitude.shiftedBy(double), TimeShiftable.shiftedBy(double), FieldSpacecraftState.shiftedBy(double)
  - toAbsoluteDate
```
public AbsoluteDate toAbsoluteDate()
```
    Transform the FieldAbsoluteDate in an AbsoluteDate.
    
    Returns:
    
    AbsoluteDate of the FieldObject
  - hasZeroField
```
public boolean hasZeroField()
```
    Check if the Field is semantically equal to zero.
    Using FieldElement.isZero()
    
    Returns:
    
    true the Field is semantically equal to zero
    
    Since:
    
    12.0

Class FieldAbsoluteDate<T extends CalculusFieldElement<T>>

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.orekit.time.FieldTimeStamped

Constructor Detail

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

FieldAbsoluteDate

Method Detail

parseCCSDSUnsegmentedTimeCode

parseCCSDSUnsegmentedTimeCode

parseCCSDSDaySegmentedTimeCode

parseCCSDSDaySegmentedTimeCode

parseCCSDSCalendarSegmentedTimeCode

parseCCSDSCalendarSegmentedTimeCode

createJDDate

createJDDate

createMJDDate

createGPSDate

createGPSDate

createJulianEpoch

createJulianEpoch

createBesselianEpoch

createBesselianEpoch

getJulianEpoch

getModifiedJulianEpoch

getFiftiesEpoch

getCCSDSEpoch

getGalileoEpoch

getGPSEpoch

getJ2000Epoch

getJavaEpoch

getPastInfinity

getFutureInfinity

getArbitraryEpoch

shiftedBy

durationFrom

durationFrom

durationFrom

durationFrom

offsetFrom

timeScalesOffset

toDate

toInstant

toInstant

getComponents

getComponents

getComponents

getDate

getField

getComponents

getComponents

compareTo

equals

isEqualTo

isCloseTo

isBefore

isAfter

isBeforeOrEqualTo

isAfterOrEqualTo

isBetween

isBetweenOrEqualTo