https://openjdk.java.net/ 
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 *
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 */

package javax.xml.datatype;

import javax.xml.namespace.QName;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.TimeZone;
import java.util.GregorianCalendar;


Representation for W3C XML Schema 1.0 date/time datatypes. Specifically, these date/time datatypes are DatatypeConstants.DATETIME, DatatypeConstants.TIME, DatatypeConstants.DATE, DatatypeConstants.GYEARMONTH, DatatypeConstants.GMONTHDAY, DatatypeConstants.GYEAR, DatatypeConstants.GMONTH, and DatatypeConstants.GDAY defined in the XML Namespace "http://www.w3.org/2001/XMLSchema". These datatypes are normatively defined in W3C XML Schema 1.0 Part 2, Section 3.2.7-14.

The table below defines the mapping between XML Schema 1.0
date/time datatype fields and this class' fields. It also summarizes
the value constraints for the date and time fields defined in
W3C XML Schema 1.0 Part 2, Appendix D,
ISO 8601 Date and Time Formats.



  Date/Time Datatype Field Mapping Between XML Schema 1.0 and Java Representation
  
    

      XML Schema 1.0

          datatype

           field		
      Related
XMLGregorianCalendar
Accessor(s)		
      Value Range
    

  
  
    

      year
       getYear() + getEon() or
 getEonAndYear 		
       getYear() is a value between -(10^9-1) to (10^9)-1 or DatatypeConstants.FIELD_UNDEFINED.
 getEon() is high order year value in billion of years.
 getEon() has values greater than or equal to (10^9) or less than or equal to -(10^9). A value of null indicates field is undefined.

           Given that XML Schema 1.0 errata states that the year zero
           will be a valid lexical value in a future version of XML Schema,
           this class allows the year field to be set to zero. Otherwise,
           the year field value is handled exactly as described
           in the errata and [ISO-8601-1988]. Note that W3C XML Schema 1.0
           validation does not allow for the year field to have a value of zero.
           		
    

    

      month
       getMonth() 
       1 to 12 or DatatypeConstants.FIELD_UNDEFINED 
    

    

      day
       getDay() 
       Independent of month, max range is 1 to 31 or DatatypeConstants.FIELD_UNDEFINED.

           The normative value constraint stated relative to month
           field's value is in W3C XML Schema 1.0 Part 2, Appendix D.
      		
    

    

      hour
      getHour()
       0 to 23 or DatatypeConstants.FIELD_UNDEFINED. An hour value of 24 is allowed to be set in the lexical space provided the minute and second field values are zero. However, an hour value of 24 is not allowed in value space and will be transformed to represent the value of the first instance of the following day as per 
        XML Schema Part 2: Datatypes Second Edition, 3.2 Primitive datatypes.
      
    

    

      minute
       getMinute() 
       0 to 59 or DatatypeConstants.FIELD_UNDEFINED 
    

    

      second
       getSecond() + getMillisecond()/1000 or
 getSecond() + getFractionalSecond() 		
       getSecond() from 0 to 60 or DatatypeConstants.FIELD_UNDEFINED.

        (Note: 60 only allowable for leap second.)
 getFractionalSecond() allows for infinite precision over the range from 0.0 to 1.0 when the getSecond() is defined.
 FractionalSecond is optional and has a value of null when it is undefined.
 getMillisecond() is the convenience millisecond precision of value of getFractionalSecond(). 		
    

    

      timezone
       getTimezone() 
       Number of minutes or DatatypeConstants.FIELD_UNDEFINED. Value range from -14 hours (-14 * 60 minutes) to 14 hours (14 * 60 minutes). 
    

  
 


All maximum value space constraints listed for the fields in the table above are checked by factory methods, DatatypeFactory, setter methods and parse methods of this class. IllegalArgumentException is thrown when a parameter's value is outside the value constraint for the field or if the composite values constitute an invalid XMLGregorianCalendar instance (for example, if the 31st of June is specified). 
The following operations are defined for this class:



Author:Joseph Fialli, Kohsuke Kawaguchi, Jeff Suttor, Sunitha Reddy
See Also:
Since:1.5
/**
 * <p>Representation for W3C XML Schema 1.0 date/time datatypes.
 * Specifically, these date/time datatypes are
 * {@link DatatypeConstants#DATETIME},
 * {@link DatatypeConstants#TIME},
 * {@link DatatypeConstants#DATE},
 * {@link DatatypeConstants#GYEARMONTH},
 * {@link DatatypeConstants#GMONTHDAY},
 * {@link DatatypeConstants#GYEAR},
 * {@link DatatypeConstants#GMONTH}, and
 * {@link DatatypeConstants#GDAY}
 * defined in the XML Namespace
 * {@code "http://www.w3.org/2001/XMLSchema"}.
 * These datatypes are normatively defined in
 * <a href="http://www.w3.org/TR/xmlschema-2/#dateTime">W3C XML Schema 1.0 Part 2, Section 3.2.7-14</a>.
 *
 * <p>The table below defines the mapping between XML Schema 1.0
 * date/time datatype fields and this class' fields. It also summarizes
 * the value constraints for the date and time fields defined in
 * <a href="http://www.w3.org/TR/xmlschema-2/#isoformats">W3C XML Schema 1.0 Part 2, Appendix D,
 * <i>ISO 8601 Date and Time Formats</i></a>.
 *
 * <a id="datetimefieldmapping"></a>
 * <table class="striped">
 *   <caption>Date/Time Datatype Field Mapping Between XML Schema 1.0 and Java Representation</caption>
 *   <thead>
 *     <tr>
 *       <th>XML Schema 1.0<br>
 *           datatype<br>
 *            field</th>
 *       <th>Related<br>XMLGregorianCalendar<br>Accessor(s)</th>
 *       <th>Value Range</th>
 *     </tr>
 *   </thead>
 *   <tbody>
 *     <tr>
 *       <td><a id="datetimefield-year">year</a></td>
 *       <td> {@link #getYear()} + {@link #getEon()} or<br>
 *            {@link #getEonAndYear}
 *       </td>
 *       <td> {@code getYear()} is a value between -(10^9-1) to (10^9)-1
 *            or {@link DatatypeConstants#FIELD_UNDEFINED}.<br>
 *            {@link #getEon()} is high order year value in billion of years.<br>
 *            {@code getEon()} has values greater than or equal to (10^9) or less than or equal to -(10^9).
 *            A value of null indicates field is undefined.<br>
 *            Given that <a href="http://www.w3.org/2001/05/xmlschema-errata#e2-63">XML Schema 1.0 errata</a> states that the year zero
 *            will be a valid lexical value in a future version of XML Schema,
 *            this class allows the year field to be set to zero. Otherwise,
 *            the year field value is handled exactly as described
 *            in the errata and [ISO-8601-1988]. Note that W3C XML Schema 1.0
 *            validation does not allow for the year field to have a value of zero.
 *            </td>
 *     </tr>
 *     <tr>
 *       <td><a id="datetimefield-month">month</a></td>
 *       <td> {@link #getMonth()} </td>
 *       <td> 1 to 12 or {@link DatatypeConstants#FIELD_UNDEFINED} </td>
 *     </tr>
 *     <tr>
 *       <td><a id="datetimefield-day">day</a></td>
 *       <td> {@link #getDay()} </td>
 *       <td> Independent of month, max range is 1 to 31 or {@link DatatypeConstants#FIELD_UNDEFINED}.<br>
 *            The normative value constraint stated relative to month
 *            field's value is in <a href="http://www.w3.org/TR/xmlschema-2/#isoformats">W3C XML Schema 1.0 Part 2, Appendix D</a>.
 *       </td>
 *     </tr>
 *     <tr>
 *       <td><a id="datetimefield-hour">hour</a></td>
 *       <td>{@link #getHour()}</td>
 *       <td>
 *         0 to 23 or {@link DatatypeConstants#FIELD_UNDEFINED}.
 *         An hour value of 24 is allowed to be set in the lexical space provided the minute and second
 *         field values are zero. However, an hour value of 24 is not allowed in value space and will be
 *         transformed to represent the value of the first instance of the following day as per
 *         <a href="http://www.w3.org/TR/xmlschema-2/#built-in-primitive-datatypes">
 *         XML Schema Part 2: Datatypes Second Edition, 3.2 Primitive datatypes</a>.
 *       </td>
 *     </tr>
 *     <tr>
 *       <td><a id="datetimefield-minute">minute</a></td>
 *       <td> {@link #getMinute()} </td>
 *       <td> 0 to 59 or {@link DatatypeConstants#FIELD_UNDEFINED} </td>
 *     </tr>
 *     <tr>
 *       <td><a id="datetimefield-second">second</a></td>
 *       <td>
 *         {@link #getSecond()} + {@link #getMillisecond()}/1000 or<br>
 *         {@link #getSecond()} + {@link #getFractionalSecond()}
 *       </td>
 *       <td>
 *         {@link #getSecond()} from 0 to 60 or {@link DatatypeConstants#FIELD_UNDEFINED}.<br>
 *         <i>(Note: 60 only allowable for leap second.)</i><br>
 *         {@link #getFractionalSecond()} allows for infinite precision over the range from 0.0 to 1.0 when
 *         the {@link #getSecond()} is defined.<br>
 *         {@code FractionalSecond} is optional and has a value of {@code null} when it is undefined.<br>
 *            {@link #getMillisecond()} is the convenience
 *            millisecond precision of value of {@link #getFractionalSecond()}.
 *       </td>
 *     </tr>
 *     <tr>
 *       <td><a id="datetimefield-timezone">timezone</a></td>
 *       <td> {@link #getTimezone()} </td>
 *       <td> Number of minutes or {@link DatatypeConstants#FIELD_UNDEFINED}.
 *         Value range from -14 hours (-14 * 60 minutes) to 14 hours (14 * 60 minutes).
 *       </td>
 *     </tr>
 *   </tbody>
 *  </table>
 *
 * <p>All maximum value space constraints listed for the fields in the table
 * above are checked by factory methods, {@link DatatypeFactory},
 * setter methods and parse methods of
 * this class. {@code IllegalArgumentException} is thrown when a
 * parameter's value is outside the value constraint for the field or
 * if the composite
 * values constitute an invalid XMLGregorianCalendar instance (for example, if
 * the 31st of June is specified).
 *
 * <p>The following operations are defined for this class:
 * <ul>
 *   <li>accessors/mutators for independent date/time fields</li>
 *   <li>conversion between this class and W3C XML Schema 1.0 lexical representation,
 *     {@link #toString()}, {@link DatatypeFactory#newXMLGregorianCalendar(String lexicalRepresentation)}</li>
 *   <li>conversion between this class and {@link GregorianCalendar},
 *     {@link #toGregorianCalendar(java.util.TimeZone timezone, java.util.Locale aLocale, XMLGregorianCalendar defaults)},
 *     {@link DatatypeFactory}</li>
 *   <li>partial order relation comparator method, {@link #compare(XMLGregorianCalendar xmlGregorianCalendar)}</li>
 *   <li>{@link #equals(Object)} defined relative to {@link #compare(XMLGregorianCalendar xmlGregorianCalendar)}.</li>
 *   <li>addition operation with {@link Duration}
 *      instance as defined in <a href="http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes">
 *      W3C XML Schema 1.0 Part 2, Appendix E, <i>Adding durations to dateTimes</i></a>.
 *   </li>
 * </ul>
 *
 * @author <a href="mailto:Joseph.Fialli@Sun.com">Joseph Fialli</a>
 * @author <a href="mailto:Kohsuke.Kawaguchi@Sun.com">Kohsuke Kawaguchi</a>
 * @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
 * @author <a href="mailto:Sunitha.Reddy@Sun.com">Sunitha Reddy</a>
 * @see Duration
 * @see DatatypeFactory
 * @since 1.5
 */

public abstract class XMLGregorianCalendar
        implements Cloneable {

    
Default no-arg constructor.

Note: Always use the DatatypeFactory to construct an instance of XMLGregorianCalendar. The constructor on this class cannot be guaranteed to produce an object with a consistent state and may be removed in the future. 
/**
     * Default no-arg constructor.
     *
     * <p>Note: Always use the {@link DatatypeFactory} to
     * construct an instance of {@code XMLGregorianCalendar}.
     * The constructor on this class cannot be guaranteed to
     * produce an object with a consistent state and may be
     * removed in the future.
     */
    public XMLGregorianCalendar() {
    }

    
Unset all fields to undefined.

Set all int fields to DatatypeConstants.FIELD_UNDEFINED and reference fields to null. 
/**
     * Unset all fields to undefined.
     *
     * <p>Set all int fields to {@link DatatypeConstants#FIELD_UNDEFINED} and reference fields
     * to null.
     */
    public abstract void clear();

    
Reset this XMLGregorianCalendar to its original values. 
XMLGregorianCalendar is reset to the same values as when it was created with DatatypeFactory.newXMLGregorianCalendar(), DatatypeFactory.newXMLGregorianCalendar(String lexicalRepresentation), DatatypeFactory.newXMLGregorianCalendar(BigInteger year, int month, int day, int hour, int minute, int second, BigDecimal fractionalSecond, int timezone), DatatypeFactory.newXMLGregorianCalendar(int year, int month, int day, int hour, int minute, int second, int millisecond, int timezone), DatatypeFactory.newXMLGregorianCalendar(GregorianCalendar cal), DatatypeFactory.newXMLGregorianCalendarDate(int year, int month, int day, int timezone), DatatypeFactory.newXMLGregorianCalendarTime(int hours, int minutes, int seconds, int timezone), DatatypeFactory.newXMLGregorianCalendarTime(int hours, int minutes, int seconds, BigDecimal fractionalSecond, int timezone) or DatatypeFactory.newXMLGregorianCalendarTime(int hours, int minutes, int seconds, int milliseconds, int timezone). 
reset() is designed to allow the reuse of existing XMLGregorianCalendars thus saving resources associated with the creation of new XMLGregorianCalendars. 
/**
     * Reset this {@code XMLGregorianCalendar} to its original values.
     *
     * <p>{@code XMLGregorianCalendar} is reset to the same values as when it was created with
     * {@link DatatypeFactory#newXMLGregorianCalendar()},
     * {@link DatatypeFactory#newXMLGregorianCalendar(String lexicalRepresentation)},
     * {@link DatatypeFactory#newXMLGregorianCalendar(
     *   BigInteger year,
     *   int month,
     *   int day,
     *   int hour,
     *   int minute,
     *   int second,
     *   BigDecimal fractionalSecond,
     *   int timezone)},
     * {@link DatatypeFactory#newXMLGregorianCalendar(
     *   int year,
     *   int month,
     *   int day,
     *   int hour,
     *   int minute,
     *   int second,
     *   int millisecond,
     *   int timezone)},
     * {@link DatatypeFactory#newXMLGregorianCalendar(GregorianCalendar cal)},
     * {@link DatatypeFactory#newXMLGregorianCalendarDate(
     *   int year,
     *   int month,
     *   int day,
     *   int timezone)},
     * {@link DatatypeFactory#newXMLGregorianCalendarTime(
     *   int hours,
     *   int minutes,
     *   int seconds,
     *   int timezone)},
     * {@link DatatypeFactory#newXMLGregorianCalendarTime(
     *   int hours,
     *   int minutes,
     *   int seconds,
     *   BigDecimal fractionalSecond,
     *   int timezone)} or
     * {@link DatatypeFactory#newXMLGregorianCalendarTime(
     *   int hours,
     *   int minutes,
     *   int seconds,
     *   int milliseconds,
     *   int timezone)}.
     *
     * <p>{@code reset()} is designed to allow the reuse of existing {@code XMLGregorianCalendar}s
     * thus saving resources associated with the creation of new {@code XMLGregorianCalendar}s.
     */
    public abstract void reset();

    
Set low and high order component of XSD dateTime year field. 
Unset this field by invoking the setter with a parameter value of null. 
Params:
Throws:
/**
     * Set low and high order component of XSD {@code dateTime} year field.
     *
     * <p>Unset this field by invoking the setter with a parameter value of {@code null}.
     *
     * @param year value constraints summarized in <a href="#datetimefield-year">year field of date/time field mapping table</a>.
     *
     * @throws IllegalArgumentException if {@code year} parameter is
     * outside value constraints for the field as specified in
     * <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public abstract void setYear(BigInteger year);

    
Set year of XSD dateTime year field. 
Unset this field by invoking the setter with a parameter value of DatatypeConstants.FIELD_UNDEFINED. 
Note: if the absolute value of the year parameter is less than 10^9, the eon component of the XSD year field is set to null by this method. 
Params:
/**
     * Set year of XSD {@code dateTime} year field.
     *
     * <p>Unset this field by invoking the setter with a parameter value of
     * {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * <p>Note: if the absolute value of the {@code year} parameter
     * is less than 10^9, the eon component of the XSD year field is set to
     * {@code null} by this method.
     *
     * @param year value constraints are summarized in <a href="#datetimefield-year">year field of date/time field mapping table</a>.
     *   If year is {@link DatatypeConstants#FIELD_UNDEFINED}, then eon is set to {@code null}.
     */
    public abstract void setYear(int year);

    
Set month.

Unset this field by invoking the setter with a parameter value of DatatypeConstants.FIELD_UNDEFINED. 
Params:
Throws:
/**
     * Set month.
     *
     * <p>Unset this field by invoking the setter with a parameter value of {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * @param month value constraints summarized in <a href="#datetimefield-month">month field of date/time field mapping table</a>.
     *
     * @throws IllegalArgumentException if {@code month} parameter is
     * outside value constraints for the field as specified in
     * <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public abstract void setMonth(int month);

    
Set days in month.

Unset this field by invoking the setter with a parameter value of DatatypeConstants.FIELD_UNDEFINED. 
Params:
Throws:
/**
     * Set days in month.
     *
     * <p>Unset this field by invoking the setter with a parameter value of {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * @param day value constraints summarized in <a href="#datetimefield-day">day field of date/time field mapping table</a>.
     *
     * @throws IllegalArgumentException if {@code day} parameter is
     * outside value constraints for the field as specified in
     * <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public abstract void setDay(int day);

    
Set the number of minutes in the timezone offset.

Unset this field by invoking the setter with a parameter value of DatatypeConstants.FIELD_UNDEFINED. 
Params:
Throws:
/**
     * Set the number of minutes in the timezone offset.
     *
     * <p>Unset this field by invoking the setter with a parameter value of {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * @param offset value constraints summarized in <a href="#datetimefield-timezone">
     *   timezone field of date/time field mapping table</a>.
     *
     * @throws IllegalArgumentException if {@code offset} parameter is
     * outside value constraints for the field as specified in
     * <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public abstract void setTimezone(int offset);

    
Set time as one unit.

Params:
Throws:
See Also:
/**
     * Set time as one unit.
     *
     * @param hour value constraints are summarized in
     * <a href="#datetimefield-hour">hour field of date/time field mapping table</a>.
     * @param minute value constraints are summarized in
     * <a href="#datetimefield-minute">minute field of date/time field mapping table</a>.
     * @param second value constraints are summarized in
     * <a href="#datetimefield-second">second field of date/time field mapping table</a>.
     *
     * @see #setTime(int, int, int, BigDecimal)
     *
     * @throws IllegalArgumentException if any parameter is
     * outside value constraints for the field as specified in
     * <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public void setTime(int hour, int minute, int second) {

        setTime(
                hour,
                minute,
                second,
                null // fractional
        );
    }

    
Set hours.

Unset this field by invoking the setter with a parameter value of DatatypeConstants.FIELD_UNDEFINED. 
Params:
Throws:
/**
     * Set hours.
     *
     * <p>Unset this field by invoking the setter with a parameter value of {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * @param hour value constraints summarized in <a href="#datetimefield-hour">hour field of date/time field mapping table</a>.
     *
     * @throws IllegalArgumentException if {@code hour} parameter is outside value constraints for the field as specified in
     *   <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public abstract void setHour(int hour);

    
Set minutes.

Unset this field by invoking the setter with a parameter value of DatatypeConstants.FIELD_UNDEFINED. 
Params:
Throws:
/**
     * Set minutes.
     *
     * <p>Unset this field by invoking the setter with a parameter value of {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * @param minute value constraints summarized in <a href="#datetimefield-minute">minute field of date/time field mapping table</a>.
     *
     * @throws IllegalArgumentException if {@code minute} parameter is outside value constraints for the field as specified in
     *   <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public abstract void setMinute(int minute);

    
Set seconds.

Unset this field by invoking the setter with a parameter value of DatatypeConstants.FIELD_UNDEFINED. 
Params:
Throws:
/**
     * Set seconds.
     *
     * <p>Unset this field by invoking the setter with a parameter value of {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * @param second value constraints summarized in <a href="#datetimefield-second">second field of date/time field mapping table</a>.
     *
     * @throws IllegalArgumentException if {@code second} parameter is outside value constraints for the field as specified in
     *   <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public abstract void setSecond(int second);

    
Set milliseconds.

Unset this field by invoking the setter with a parameter value of DatatypeConstants.FIELD_UNDEFINED. 
Params:
Throws:
/**
     * Set milliseconds.
     *
     * <p>Unset this field by invoking the setter with a parameter value of {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * @param millisecond value constraints summarized in
     *   <a href="#datetimefield-second">second field of date/time field mapping table</a>.
     *
     * @throws IllegalArgumentException if {@code millisecond} parameter is outside value constraints for the field as specified
     *   in <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public abstract void setMillisecond(int millisecond);

    
Set fractional seconds.

Unset this field by invoking the setter with a parameter value of null. 
Params:
Throws:
/**
     * Set fractional seconds.
     *
     * <p>Unset this field by invoking the setter with a parameter value of {@code null}.
     *
     * @param fractional value constraints summarized in
     *   <a href="#datetimefield-second">second field of date/time field mapping table</a>.
     *
     * @throws IllegalArgumentException if {@code fractional} parameter is outside value constraints for the field as specified
     *   in <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public abstract void setFractionalSecond(BigDecimal fractional);


    
Set time as one unit, including the optional infinite precision
fractional seconds.

Params:
Throws:
/**
     * Set time as one unit, including the optional infinite precision
     * fractional seconds.
     *
     * @param hour value constraints are summarized in
     * <a href="#datetimefield-hour">hour field of date/time field mapping table</a>.
     * @param minute value constraints are summarized in
     * <a href="#datetimefield-minute">minute field of date/time field mapping table</a>.
     * @param second value constraints are summarized in
     * <a href="#datetimefield-second">second field of date/time field mapping table</a>.
     * @param fractional value of {@code null} indicates this optional
     *   field is not set.
     *
     * @throws IllegalArgumentException if any parameter is
     * outside value constraints for the field as specified in
     * <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public void setTime(
            int hour,
            int minute,
            int second,
            BigDecimal fractional) {

        setHour(hour);
        setMinute(minute);
        setSecond(second);
        setFractionalSecond(fractional);
    }


    
Set time as one unit, including optional milliseconds.

Params:
Throws:
/**
     * Set time as one unit, including optional milliseconds.
     *
     * @param hour value constraints are summarized in
     * <a href="#datetimefield-hour">hour field of date/time field mapping table</a>.
     * @param minute value constraints are summarized in
     * <a href="#datetimefield-minute">minute field of date/time field mapping table</a>.
     * @param second value constraints are summarized in
     * <a href="#datetimefield-second">second field of date/time field mapping table</a>.
     * @param millisecond value of {@link DatatypeConstants#FIELD_UNDEFINED} indicates this
     *                    optional field is not set.
     *
     * @throws IllegalArgumentException if any parameter is
     * outside value constraints for the field as specified in
     * <a href="#datetimefieldmapping">date/time field mapping table</a>.
     */
    public void setTime(int hour, int minute, int second, int millisecond) {

        setHour(hour);
        setMinute(minute);
        setSecond(second);
        setMillisecond(millisecond);
    }

    
Returns the high order component for XML Schema 1.0 dateTime datatype field for year. null if this optional part of the year field is not defined. 
Value constraints for this value are summarized in
year field of date/time field mapping table.

See Also:
Returns:The eon of this XMLGregorianCalendar. The value returned is an integer multiple of 10^9.
/**
     * Returns the high order component for XML Schema 1.0 dateTime datatype field for
     * {@code year}.
     * {@code null} if this optional part of the year field is not defined.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-year">year field of date/time field mapping table</a>.
     * @return The eon of this {@code XMLGregorianCalendar}. The value
     * returned is an integer multiple of 10^9.
     *
     * @see #getYear()
     * @see #getEonAndYear()
     */
    public abstract BigInteger getEon();

    
Returns the low order component for XML Schema 1.0 dateTime datatype field for year or DatatypeConstants.FIELD_UNDEFINED. 
Value constraints for this value are summarized in
year field of date/time field mapping table.

See Also:
Returns:The year of this XMLGregorianCalendar.
/**
     * Returns the low order component for XML Schema 1.0 dateTime datatype field for
     * {@code year} or {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-year">year field of date/time field mapping table</a>.
     *
     * @return The year of this {@code XMLGregorianCalendar}.
     *
     * @see #getEon()
     * @see #getEonAndYear()
     */
    public abstract int getYear();

    
Returns the XML Schema 1.0 dateTime datatype field for year. 
Value constraints for this value are summarized in
year field of date/time field mapping table.

See Also:
Returns:sum of eon and BigInteger.valueOf(year) when both fields are defined. When only year is defined, return it. When both eon and year are not defined, return null.
/**
     * Returns the XML Schema 1.0 dateTime datatype field for
     * {@code year}.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-year">year field of date/time field mapping table</a>.
     *
     * @return sum of {@code eon} and {@code BigInteger.valueOf(year)}
     * when both fields are defined. When only {@code year} is defined,
     * return it. When both {@code eon} and {@code year} are not
     * defined, return {@code null}.
     *
     * @see #getEon()
     * @see #getYear()
     */
    public abstract BigInteger getEonAndYear();

    
Returns the month of this calendar or DatatypeConstants.FIELD_UNDEFINED. 
Value constraints for this value are summarized in
month field of date/time field mapping table.

Returns:The month of this XMLGregorianCalendar, from 1 to 12.
/**
     * Returns the month of this calendar or {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-month">month field of date/time field mapping table</a>.
     *
     * @return The month of this {@code XMLGregorianCalendar}, from 1 to 12.
     *
     */
    public abstract int getMonth();

    
Returns the day of month or DatatypeConstants.FIELD_UNDEFINED. 
Value constraints for this value are summarized in
day field of date/time field mapping table.

See Also:
Returns:The day of month of this XMLGregorianCalendar, from 1 to 31.
/**
     * Returns the day of month or {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-day">day field of date/time field mapping table</a>.
     *
     * @return The day of month of this {@code XMLGregorianCalendar}, from 1 to 31.
     *
     * @see #setDay(int)
     */
    public abstract int getDay();

    
Returns the Timezone offset in minutes or DatatypeConstants.FIELD_UNDEFINED if this optional field is not defined. 
Value constraints for this value are summarized in
timezone field of date/time field mapping table.

See Also:
Returns:The Timezone offset in minutes of this XMLGregorianCalendar.
/**
     * Returns the Timezone offset in minutes or
     * {@link DatatypeConstants#FIELD_UNDEFINED} if this optional field is not defined.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-timezone">timezone field of date/time field mapping table</a>.
     *
     * @return The Timezone offset in minutes of this {@code XMLGregorianCalendar}.
     *
     * @see #setTimezone(int)
     */
    public abstract int getTimezone();

    
Returns the hour of day or DatatypeConstants.FIELD_UNDEFINED if this field is not defined. 
Value constraints for this value are summarized in
hour field of date/time field mapping table.

See Also:
Returns:The hour of day of this XMLGregorianCalendar, from 0 to 23.
/**
     * Returns the hour of day or
     * {@link DatatypeConstants#FIELD_UNDEFINED} if this field is not defined.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-hour">hour field of date/time field mapping table</a>.
     *
     * @return The hour of day of this {@code XMLGregorianCalendar}, from 0 to 23.
     *
     * @see #setTime(int, int, int)
     */
    public abstract int getHour();

    
Returns the minute of hour or DatatypeConstants.FIELD_UNDEFINED if this field is not defined. 
Value constraints for this value are summarized in
minute field of date/time field mapping table.

See Also:
Returns:The minute of hour of this XMLGregorianCalendar, from 0 to 59.
/**
     * Returns the minute of hour or
     * {@link DatatypeConstants#FIELD_UNDEFINED} if this field is not defined.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-minute">minute field of date/time field mapping table</a>.
     *
     * @return The minute of hour of this {@code XMLGregorianCalendar}, from 0 to 59.
     *
     * @see #setTime(int, int, int)
     */
    public abstract int getMinute();

    
Returns the second of minute or DatatypeConstants.FIELD_UNDEFINED if this field is not defined. When this field is not defined, the optional xs:dateTime fractional seconds field, represented by getFractionalSecond() and getMillisecond(), must not be defined. 
Value constraints for this value are summarized in
second field of date/time field mapping table.

See Also:
Returns:The second of minute of this XMLGregorianCalendar, from 0 to 59.
/**
     * Returns the second of minute or
     * {@link DatatypeConstants#FIELD_UNDEFINED} if this field is not defined.
     * When this field is not defined, the optional xs:dateTime
     * fractional seconds field, represented by
     * {@link #getFractionalSecond()} and {@link #getMillisecond()},
     * must not be defined.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-second">second field of date/time field mapping table</a>.
     *
     * @return The second of minute of this {@code XMLGregorianCalendar},  from 0 to 59.
     *
     * @see #getFractionalSecond()
     * @see #getMillisecond()
     * @see #setTime(int, int, int)
     */
    public abstract int getSecond();

    
Returns the millisecond precision of getFractionalSecond(). 
This method represents a convenience accessor to infinite precision fractional second value returned by getFractionalSecond(). The returned value is the rounded down to milliseconds value of getFractionalSecond(). When getFractionalSecond() returns null, this method must return DatatypeConstants.FIELD_UNDEFINED. 
Value constraints for this value are summarized in
second field of date/time field mapping table.

See Also:
Returns:The millisecond precision of this XMLGregorianCalendar.
/**
     * Returns the millisecond precision of {@link #getFractionalSecond()}.
     *
     * <p>This method represents a convenience accessor to infinite
     * precision fractional second value returned by
     * {@link #getFractionalSecond()}. The returned value is the rounded
     * down to milliseconds value of
     * {@link #getFractionalSecond()}. When {@link #getFractionalSecond()}
     * returns {@code null}, this method must return
     * {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * <p>Value constraints for this value are summarized in
     * <a href="#datetimefield-second">second field of date/time field mapping table</a>.
     *
     * @return The millisecond precision of this {@code XMLGregorianCalendar}.
     *
     * @see #getFractionalSecond()
     * @see #setTime(int, int, int)
     */
    public int getMillisecond() {

        BigDecimal fractionalSeconds = getFractionalSecond();

        // is field undefined?
        if (fractionalSeconds == null) {
            return DatatypeConstants.FIELD_UNDEFINED;
        }

        return getFractionalSecond().movePointRight(3).intValue();
    }

    
Returns fractional seconds.

null is returned when this optional field is not defined. 
Value constraints are detailed in
second field of date/time field mapping table.

This optional field can only have a defined value when the xs:dateTime second field, represented by getSecond(), does not return DatatypeConstants.FIELD_UNDEFINED. 
See Also:
Returns:Fractional seconds of this XMLGregorianCalendar.
/**
     * Returns fractional seconds.
     *
     * <p>{@code null} is returned when this optional field is not defined.
     *
     * <p>Value constraints are detailed in
     * <a href="#datetimefield-second">second field of date/time field mapping table</a>.
     *
     * <p>This optional field can only have a defined value when the
     * xs:dateTime second field, represented by {@link #getSecond()},
     * does not return {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * @return Fractional seconds of this {@code XMLGregorianCalendar}.
     *
     * @see #getSecond()
     * @see #setTime(int, int, int, BigDecimal)
     */
    public abstract BigDecimal getFractionalSecond();

    // comparisons
    
Compare two instances of W3C XML Schema 1.0 date/time datatypes
according to partial order relation defined in
W3C XML Schema 1.0 Part 2, Section 3.2.7.3,
Order relation on dateTime.

xsd:dateTime datatype field mapping to accessors of this class are defined in date/time field mapping table.

Params:
  • xmlGregorianCalendar – Instance of XMLGregorianCalendar to compare
Throws:
Returns:The relationship between this XMLGregorianCalendar and the specified xmlGregorianCalendar as DatatypeConstants.LESSER, DatatypeConstants.EQUAL, DatatypeConstants.GREATER or DatatypeConstants.INDETERMINATE.
/**
     * Compare two instances of W3C XML Schema 1.0 date/time datatypes
     * according to partial order relation defined in
     * <a href="http://www.w3.org/TR/xmlschema-2/#dateTime-order">W3C XML Schema 1.0 Part 2, Section 3.2.7.3,
     * <i>Order relation on dateTime</i></a>.
     *
     * <p>{@code xsd:dateTime} datatype field mapping to accessors of
     * this class are defined in
     * <a href="#datetimefieldmapping">date/time field mapping table</a>.
     *
     * @param xmlGregorianCalendar Instance of {@code XMLGregorianCalendar} to compare
     *
     * @return The relationship between {@code this} {@code XMLGregorianCalendar} and
     *   the specified {@code xmlGregorianCalendar} as
     *   {@link DatatypeConstants#LESSER},
     *   {@link DatatypeConstants#EQUAL},
     *   {@link DatatypeConstants#GREATER} or
     *   {@link DatatypeConstants#INDETERMINATE}.
     *
     * @throws NullPointerException if {@code xmlGregorianCalendar} is null.
     */
    public abstract int compare(XMLGregorianCalendar xmlGregorianCalendar);

    
Normalize this instance to UTC.

2000-03-04T23:00:00+03:00 normalizes to 2000-03-04T20:00:00Z

Implements W3C XML Schema Part 2, Section 3.2.7.3 (A).

Returns:this XMLGregorianCalendar normalized to UTC.
/**
     * Normalize this instance to UTC.
     *
     * <p>2000-03-04T23:00:00+03:00 normalizes to 2000-03-04T20:00:00Z
     * <p>Implements W3C XML Schema Part 2, Section 3.2.7.3 (A).
     *
     * @return {@code this} {@code XMLGregorianCalendar} normalized to UTC.
     */
    public abstract XMLGregorianCalendar normalize();

    
Compares this calendar to the specified object. The result is true if and only if the argument is not null and is an XMLGregorianCalendar object that represents the same instant in time as this object. 
Params:
  • obj – to compare.
Returns:true when obj is an instance of XMLGregorianCalendar and compare(XMLGregorianCalendar obj) returns DatatypeConstants.EQUAL, otherwise false.
/**
     * Compares this calendar to the specified object. The result is
     * {@code true} if and only if the argument is not null and is an
     * {@code XMLGregorianCalendar} object that represents the same
     * instant in time as this object.
     *
     * @param obj to compare.
     *
     * @return {@code true} when {@code obj} is an instance of
     * {@code XMLGregorianCalendar} and
     * {@link #compare(XMLGregorianCalendar obj)}
     * returns {@link DatatypeConstants#EQUAL},
     * otherwise {@code false}.
     */
    @Override
    public boolean equals(Object obj) {

        if (obj == null || !(obj instanceof XMLGregorianCalendar)) {
            return false;
        }
        return compare((XMLGregorianCalendar) obj) == DatatypeConstants.EQUAL;
    }

    
Returns a hash code consistent with the definition of the equals method.

Returns:hash code of this object.
/**
     * Returns a hash code consistent with the definition of the equals method.
     *
     * @return hash code of this object.
     */
    @Override
    public int hashCode() {

        // Following two dates compare to EQUALS since in different timezones.
        // 2000-01-15T12:00:00-05:00 == 2000-01-15T13:00:00-04:00
        //
        // Must ensure both instances generate same hashcode by normalizing
        // this to UTC timezone.
        int timezone = getTimezone();
        if (timezone == DatatypeConstants.FIELD_UNDEFINED) {
            timezone = 0;
        }
        XMLGregorianCalendar gc = this;
        if (timezone != 0) {
            gc = this.normalize();
        }
        return gc.getYear()
                + gc.getMonth()
                + gc.getDay()
                + gc.getHour()
                + gc.getMinute()
                + gc.getSecond();
    }

    
Return the lexical representation of this instance. The format is specified in XML Schema 1.0 Part 2, Section 3.2.[7-14].1,
Lexical Representation".

Specific target lexical representation format is determined by getXMLSchemaType(). 
Throws:
  • IllegalStateException – if the combination of set fields
   does not match one of the eight defined XML Schema builtin date/time datatypes.
Returns:XML, as String, representation of this XMLGregorianCalendar
/**
     * Return the lexical representation of {@code this} instance.
     * The format is specified in
     * <a href="http://www.w3.org/TR/xmlschema-2/#dateTime-order">XML Schema 1.0 Part 2, Section 3.2.[7-14].1,
     * <i>Lexical Representation</i>".</a>
     *
     * <p>Specific target lexical representation format is determined by
     * {@link #getXMLSchemaType()}.
     *
     * @return XML, as {@code String}, representation of this {@code XMLGregorianCalendar}
     *
     * @throws IllegalStateException if the combination of set fields
     *    does not match one of the eight defined XML Schema builtin date/time datatypes.
     */
    public abstract String toXMLFormat();

    
Return the name of the XML Schema date/time type that this instance
maps to. Type is computed based on fields that are set.


  Required fields for XML Schema 1.0 Date/Time Datatypes.

        (timezone is optional for all date/time datatypes)
  
    

      Datatype
      year
      month
      day
      hour
      minute
      second
    

  
  
    

      DatatypeConstants.DATETIME
      X
      X
      X
      X
      X
      X
    

    

      DatatypeConstants.DATE
      X
      X
      X
      
      
      
    

    

      DatatypeConstants.TIME
      
      
      
      X
      X
      X
    

    

      DatatypeConstants.GYEARMONTH
      X
      X
      
      
      
      
    

    

      DatatypeConstants.GMONTHDAY
      
      X
      X
      
      
      
    

    

      DatatypeConstants.GYEAR
      X
      
      
      
      
      
    

    

      DatatypeConstants.GMONTH
      
      X
      
      
      
      
    

    

      DatatypeConstants.GDAY
      
      
      X
      
      
      
    

  



Throws:
  • IllegalStateException – if the combination of set fields
   does not match one of the eight defined XML Schema builtin
   date/time datatypes.
Returns:One of the following class constants: DatatypeConstants.DATETIME, DatatypeConstants.TIME, DatatypeConstants.DATE, DatatypeConstants.GYEARMONTH, DatatypeConstants.GMONTHDAY, DatatypeConstants.GYEAR, DatatypeConstants.GMONTH or DatatypeConstants.GDAY.
/**
     * Return the name of the XML Schema date/time type that this instance
     * maps to. Type is computed based on fields that are set.
     *
     * <table class="striped">
     *   <caption>Required fields for XML Schema 1.0 Date/Time Datatypes.<br>
     *         <i>(timezone is optional for all date/time datatypes)</i></caption>
     *   <thead>
     *     <tr>
     *       <th>Datatype</th>
     *       <th>year</th>
     *       <th>month</th>
     *       <th>day</th>
     *       <th>hour</th>
     *       <th>minute</th>
     *       <th>second</th>
     *     </tr>
     *   </thead>
     *   <tbody>
     *     <tr>
     *       <td>{@link DatatypeConstants#DATETIME}</td>
     *       <td>X</td>
     *       <td>X</td>
     *       <td>X</td>
     *       <td>X</td>
     *       <td>X</td>
     *       <td>X</td>
     *     </tr>
     *     <tr>
     *       <td>{@link DatatypeConstants#DATE}</td>
     *       <td>X</td>
     *       <td>X</td>
     *       <td>X</td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *     </tr>
     *     <tr>
     *       <td>{@link DatatypeConstants#TIME}</td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *       <td>X</td>
     *       <td>X</td>
     *       <td>X</td>
     *     </tr>
     *     <tr>
     *       <td>{@link DatatypeConstants#GYEARMONTH}</td>
     *       <td>X</td>
     *       <td>X</td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *     </tr>
     *     <tr>
     *       <td>{@link DatatypeConstants#GMONTHDAY}</td>
     *       <td></td>
     *       <td>X</td>
     *       <td>X</td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *     </tr>
     *     <tr>
     *       <td>{@link DatatypeConstants#GYEAR}</td>
     *       <td>X</td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *     </tr>
     *     <tr>
     *       <td>{@link DatatypeConstants#GMONTH}</td>
     *       <td></td>
     *       <td>X</td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *     </tr>
     *     <tr>
     *       <td>{@link DatatypeConstants#GDAY}</td>
     *       <td></td>
     *       <td></td>
     *       <td>X</td>
     *       <td></td>
     *       <td></td>
     *       <td></td>
     *     </tr>
     *   </tbody>
     * </table>
     *
     * @throws java.lang.IllegalStateException if the combination of set fields
     *    does not match one of the eight defined XML Schema builtin
     *    date/time datatypes.
     * @return One of the following class constants:
     *   {@link DatatypeConstants#DATETIME},
     *   {@link DatatypeConstants#TIME},
     *   {@link DatatypeConstants#DATE},
     *   {@link DatatypeConstants#GYEARMONTH},
     *   {@link DatatypeConstants#GMONTHDAY},
     *   {@link DatatypeConstants#GYEAR},
     *   {@link DatatypeConstants#GMONTH} or
     *   {@link DatatypeConstants#GDAY}.
     */
    public abstract QName getXMLSchemaType();

    
Returns a String representation of this XMLGregorianCalendar Object. 
The result is a lexical representation generated by toXMLFormat(). 
Throws:
  • IllegalStateException – if the combination of set fields
   does not match one of the eight defined XML Schema builtin date/time datatypes.
See Also:
Returns:A non-null valid String representation of this XMLGregorianCalendar.
/**
     * Returns a {@code String} representation of this {@code XMLGregorianCalendar} {@code Object}.
     *
     * <p>The result is a lexical representation generated by {@link #toXMLFormat()}.
     *
     * @return A non-{@code null} valid {@code String} representation of this {@code XMLGregorianCalendar}.
     *
     * @throws IllegalStateException if the combination of set fields
     *    does not match one of the eight defined XML Schema builtin date/time datatypes.
     *
     * @see #toXMLFormat()
     */
    @Override
    public String toString() {

        return toXMLFormat();
    }

    
Validate instance by getXMLSchemaType() constraints. 
Returns:true if data values are valid.
/**
     * Validate instance by {@code getXMLSchemaType()} constraints.
     * @return true if data values are valid.
     */
    public abstract boolean isValid();

    
Add duration to this instance. 
The computation is specified in
XML Schema 1.0 Part 2, Appendix E,
Adding durations to dateTimes.
date/time field mapping table defines the mapping from XML Schema 1.0 dateTime fields to this class' representation of those fields. 
Params:
  • duration – Duration to add to this XMLGregorianCalendar.
Throws:
/**
     * Add {@code duration} to this instance.
     *
     * <p>The computation is specified in
     * <a href="http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes">XML Schema 1.0 Part 2, Appendix E,
     * <i>Adding durations to dateTimes</i></a>.
     * <a href="#datetimefieldmapping">date/time field mapping table</a>
     * defines the mapping from XML Schema 1.0 {@code dateTime} fields
     * to this class' representation of those fields.
     *
     * @param duration Duration to add to this {@code XMLGregorianCalendar}.
     *
     * @throws NullPointerException  when {@code duration} parameter is {@code null}.
     */
    public abstract void add(Duration duration);

    
Convert this XMLGregorianCalendar to a GregorianCalendar. 
When this instance has an undefined field, this conversion relies on the java.util.GregorianCalendar default for its corresponding field. A notable difference between XML Schema 1.0 date/time datatypes and java.util.GregorianCalendar is that Timezone value is optional for date/time datatypes and it is a required field for java.util.GregorianCalendar. See javadoc for java.util.TimeZone.getDefault() on how the default is determined. To explicitly specify the TimeZone instance, see toGregorianCalendar(TimeZone, Locale, XMLGregorianCalendar). 

  Field by Field Conversion from this class to java.util.GregorianCalendar
  
    

       java.util.GregorianCalendar field
       javax.xml.datatype.XMLGregorianCalendar field
    

  
  
    

      ERA
      getEonAndYear().signum() < 0 ? GregorianCalendar.BC : GregorianCalendar.AD
    

    

      YEAR
      getEonAndYear().abs().intValue()*
    

    

      MONTH
      getMonth() - DatatypeConstants.JANUARY + Calendar.JANUARY
    

    

      DAY_OF_MONTH
      getDay()
    

    

      HOUR_OF_DAY
      getHour()
    

    

      MINUTE
      getMinute()
    

    

      SECOND
      getSecond()
    

    

      MILLISECOND
      get millisecond order from getFractionalSecond()* 
    

    

      GregorianCalendar.setTimeZone(TimeZone)
      getTimezone() formatted into Custom timezone id
    

  


* designates possible loss of precision during the conversion due
to source datatype having higher precision than target datatype.

To ensure consistency in conversion implementations, the new GregorianCalendar should be instantiated in following manner. 
    
  
  • Using timeZone value as defined above, create a new java.util.GregorianCalendar(timeZone,Locale.getDefault()). 
    • 
  
  • Initialize all GregorianCalendar fields by calling Calendar.clear().
    • 
  
  • Obtain a pure Gregorian Calendar by invoking GregorianCalendar.setGregorianChange(
  new Date(Long.MIN_VALUE)).
    • 
  
  • Its fields ERA, YEAR, MONTH, DAY_OF_MONTH, HOUR_OF_DAY, MINUTE, SECOND and MILLISECOND are set using the method Calendar.set(int,int)
    • 



See Also:
Returns:An instance of GregorianCalendar.
/**
     * Convert this {@code XMLGregorianCalendar} to a {@link GregorianCalendar}.
     *
     * <p>When {@code this} instance has an undefined field, this
     * conversion relies on the {@code java.util.GregorianCalendar} default
     * for its corresponding field. A notable difference between
     * XML Schema 1.0 date/time datatypes and {@code java.util.GregorianCalendar}
     * is that Timezone value is optional for date/time datatypes and it is
     * a required field for {@code java.util.GregorianCalendar}. See javadoc
     * for {@code java.util.TimeZone.getDefault()} on how the default
     * is determined. To explicitly specify the {@code TimeZone}
     * instance, see
     * {@link #toGregorianCalendar(TimeZone, Locale, XMLGregorianCalendar)}.
     *
     * <table class="striped">
     *   <caption>Field by Field Conversion from this class to
     *          {@code java.util.GregorianCalendar}</caption>
     *   <thead>
     *     <tr>
     *        <th>{@code java.util.GregorianCalendar} field</th>
     *        <th>{@code javax.xml.datatype.XMLGregorianCalendar} field</th>
     *     </tr>
     *   </thead>
     *   <tbody>
     *     <tr>
     *       <td>{@code ERA}</td>
     *       <td>{@link #getEonAndYear()}{@code .signum() < 0 ? GregorianCalendar.BC : GregorianCalendar.AD}</td>
     *     </tr>
     *     <tr>
     *       <td>{@code YEAR}</td>
     *       <td>{@link #getEonAndYear()}{@code .abs().intValue()}<i>*</i></td>
     *     </tr>
     *     <tr>
     *       <td>{@code MONTH}</td>
     *       <td>{@link #getMonth()} - {@link DatatypeConstants#JANUARY} + {@link GregorianCalendar#JANUARY}</td>
     *     </tr>
     *     <tr>
     *       <td>{@code DAY_OF_MONTH}</td>
     *       <td>{@link #getDay()}</td>
     *     </tr>
     *     <tr>
     *       <td>{@code HOUR_OF_DAY}</td>
     *       <td>{@link #getHour()}</td>
     *     </tr>
     *     <tr>
     *       <td>{@code MINUTE}</td>
     *       <td>{@link #getMinute()}</td>
     *     </tr>
     *     <tr>
     *       <td>{@code SECOND}</td>
     *       <td>{@link #getSecond()}</td>
     *     </tr>
     *     <tr>
     *       <td>{@code MILLISECOND}</td>
     *       <td>get millisecond order from {@link #getFractionalSecond()}<i>*</i> </td>
     *     </tr>
     *     <tr>
     *       <td>{@code GregorianCalendar.setTimeZone(TimeZone)}</td>
     *       <td>{@link #getTimezone()} formatted into Custom timezone id</td>
     *     </tr>
     *   </tbody>
     * </table>
     * <i>*</i> designates possible loss of precision during the conversion due
     * to source datatype having higher precision than target datatype.
     *
     * <p>To ensure consistency in conversion implementations, the new
     * {@code GregorianCalendar} should be instantiated in following
     * manner.
     * <ul>
     *   <li>Using {@code timeZone} value as defined above, create a new
     * {@code java.util.GregorianCalendar(timeZone,Locale.getDefault())}.
     *   </li>
     *   <li>Initialize all GregorianCalendar fields by calling {@link java.util.GregorianCalendar#clear()}.</li>
     *   <li>Obtain a pure Gregorian Calendar by invoking
     *   {@code GregorianCalendar.setGregorianChange(
     *   new Date(Long.MIN_VALUE))}.</li>
     *   <li>Its fields ERA, YEAR, MONTH, DAY_OF_MONTH, HOUR_OF_DAY,
     *       MINUTE, SECOND and MILLISECOND are set using the method
     *       {@code Calendar.set(int,int)}</li>
     * </ul>
     *
     * @return An instance of {@link java.util.GregorianCalendar}.
     *
     * @see #toGregorianCalendar(java.util.TimeZone, java.util.Locale, XMLGregorianCalendar)
     */
    public abstract GregorianCalendar toGregorianCalendar();

    
Convert this XMLGregorianCalendar along with provided parameters to a GregorianCalendar instance. 
 Since XML Schema 1.0 date/time datetypes has no concept of timezone ids or daylight savings timezone ids, this conversion operation allows the user to explicitly specify one with timezone parameter. 
To compute the return value's TimeZone field, 
    

  • when parameter timeZone is non-null, it is the timezone field.
    • 

  • else when this.getTimezone() != FIELD_UNDEFINED, create a java.util.TimeZone with a custom timezone id using the this.getTimezone().
    • 

  • else when defaults.getTimezone() != FIELD_UNDEFINED, create a java.util.TimeZone with a custom timezone id using defaults.getTimezone().
    • 

  • else use the GregorianCalendar default timezone value for the host is defined as specified by java.util.TimeZone.getDefault().
    • 



To ensure consistency in conversion implementations, the new GregorianCalendar should be instantiated in following manner. 
    
  
  • Create a new java.util.GregorianCalendar(TimeZone,
      Locale) with TimeZone set as specified above and the Locale parameter. 
    • 
  
  • Initialize all GregorianCalendar fields by calling Calendar.clear()
    • 
  
  • Obtain a pure Gregorian Calendar by invoking GregorianCalendar.setGregorianChange(
  new Date(Long.MIN_VALUE)).
    • 
  
  • Its fields ERA, YEAR, MONTH, DAY_OF_MONTH, HOUR_OF_DAY, MINUTE, SECOND and MILLISECOND are set using the method Calendar.set(int,int)
    • 



Params:
  • timezone – provide Timezone. null is a legal value.
  • aLocale –  provide explicit Locale. Use default GregorianCalendar locale if value is null.
  • defaults – provide default field values to use when corresponding field for this instance is FIELD_UNDEFINED or null. If defaultsis null or a field within the specified defaults is undefined, just use java.util.GregorianCalendar defaults.
Returns:a java.util.GregorianCalendar conversion of this instance.
/**
     * Convert this {@code XMLGregorianCalendar} along with provided parameters
     * to a {@link GregorianCalendar} instance.
     *
     * <p> Since XML Schema 1.0 date/time datetypes has no concept of
     * timezone ids or daylight savings timezone ids, this conversion operation
     * allows the user to explicitly specify one with
     * {@code timezone} parameter.
     *
     * <p>To compute the return value's {@code TimeZone} field,
     * <ul>
     * <li>when parameter {@code timeZone} is non-null,
     * it is the timezone field.</li>
     * <li>else when {@code this.getTimezone() != FIELD_UNDEFINED},
     * create a {@code java.util.TimeZone} with a custom timezone id
     * using the {@code this.getTimezone()}.</li>
     * <li>else when {@code defaults.getTimezone() != FIELD_UNDEFINED},
     * create a {@code java.util.TimeZone} with a custom timezone id
     * using {@code defaults.getTimezone()}.</li>
     * <li>else use the {@code GregorianCalendar} default timezone value
     * for the host is defined as specified by
     * {@code java.util.TimeZone.getDefault()}.</li>
     * </ul>
     *
     * <p>To ensure consistency in conversion implementations, the new
     * {@code GregorianCalendar} should be instantiated in following
     * manner.
     * <ul>
     *   <li>Create a new {@code java.util.GregorianCalendar(TimeZone,
     *       Locale)} with TimeZone set as specified above and the
     *       {@code Locale} parameter.
     *   </li>
     *   <li>Initialize all GregorianCalendar fields by calling {@link GregorianCalendar#clear()}</li>
     *   <li>Obtain a pure Gregorian Calendar by invoking
     *   {@code GregorianCalendar.setGregorianChange(
     *   new Date(Long.MIN_VALUE))}.</li>
     *   <li>Its fields ERA, YEAR, MONTH, DAY_OF_MONTH, HOUR_OF_DAY,
     *       MINUTE, SECOND and MILLISECOND are set using the method
     *       {@code Calendar.set(int,int)}</li>
     * </ul>
     *
     * @param timezone provide Timezone. {@code null} is a legal value.
     * @param aLocale  provide explicit Locale. Use default GregorianCalendar locale if
     *                 value is {@code null}.
     * @param defaults provide default field values to use when corresponding
     *                 field for this instance is FIELD_UNDEFINED or null.
     *                 If {@code defaults}is {@code null} or a field
     *                 within the specified {@code defaults} is undefined,
     *                 just use {@code java.util.GregorianCalendar} defaults.
     * @return a java.util.GregorianCalendar conversion of this instance.
     */
    public abstract GregorianCalendar toGregorianCalendar(
            java.util.TimeZone timezone,
            java.util.Locale aLocale,
            XMLGregorianCalendar defaults);

    
Returns a java.util.TimeZone for this class. 
If timezone field is defined for this instance,
returns TimeZone initialized with custom timezone id
of zoneoffset. If timezone field is undefined,
try the defaultZoneoffset that was passed in.
If defaultZoneoffset is FIELD_UNDEFINED, return
default timezone for this host.
(Same default as java.util.GregorianCalendar).

Params:
Returns:TimeZone for this.
/**
     * Returns a {@code java.util.TimeZone} for this class.
     *
     * <p>If timezone field is defined for this instance,
     * returns TimeZone initialized with custom timezone id
     * of zoneoffset. If timezone field is undefined,
     * try the defaultZoneoffset that was passed in.
     * If defaultZoneoffset is FIELD_UNDEFINED, return
     * default timezone for this host.
     * (Same default as java.util.GregorianCalendar).
     *
     * @param defaultZoneoffset default zoneoffset if this zoneoffset is
     * {@link DatatypeConstants#FIELD_UNDEFINED}.
     *
     * @return TimeZone for this.
     */
    public abstract TimeZone getTimeZone(int defaultZoneoffset);



    
Creates and returns a copy of this object.

Returns:copy of this Object
/**
     * Creates and returns a copy of this object.
     *
     * @return copy of this {@code Object}
     */
    @Override
    public abstract Object clone();
}