How to convert XMLGregorianCalendar to Date to XMLGregorianCalendar in Java - Example Tutorial

There are several ways to convert XMLGregorianCalendar to Date in Java.
You can convert XMLGregorianCalendar to either java.util.Date or java.sql.Date based upon
your need. JAXB (Java API/Architecture for XML
Bindings) is a popular framework to create XML documents from Java
Objects and Java objects from XML files. JAXB also helps to create Java classes
from XML Schema file (.XSD file). By default JAXB maps XSD data type xs:date, xs:time and xs:dateTime to XMLGregorianCalendar in Java,
but you can configure XJC to create java.util.Date objects
instead of javax.xml.datatype.XMLGregorianCalendar. Since java.util.Date
is most popular way of dealing with date and time in Java, we often need to
convert XMLGregorianCalendar instance to Date instance
in Java. Thankfully by using Java API, we can easily do this conversion of XMLGregorianCalendar to Date and Date to XMLGregorianCalendar in Java. By
the way, It's good to remember that XML Schema has three different types which
can represent either date, time or both, while java.util.Date contains
date and time information together. In this Java and XML tutorial, we will see
example of converting
XMLGregorianCalendar to Date and inverse in Java.

XMLGregorianCalendar to Date to
XMLGregorianCalendar

Here is a Java
program, which converts XMLGregorianCalendar instances
to java.util.Date instances. We have two method, one which takes XMLGregorianCalendar and return
java.util.Date, and other which takes Date and return
XMLGregorianCalendar.

import java.util.Date;

import java.util.GregorianCalendar;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.xml.datatype.DatatypeConfigurationException;

import javax.xml.datatype.DatatypeFactory;

import javax.xml.datatype.XMLGregorianCalendar;

/**

 * Java program to convert
XMLGregorianCalendar to Date and inverse i.e. java.util.Date

 * to XMLGregorianCalendar.
If you are using XJC to create Java classes from XML Schema

 * or XSD file, By default
JAXB map XSD data types xs:date, xs:time and xs:dateTime

 * to XMLGregorianCalendar
in Java.

 *

 * @author Javin Paul

 */

public class XMLCalendarToDate {

    public static void main(String args[]) {

       Date today = new Date();

     

       //Converting
date to XMLGregorianCalendar in Java

       XMLGregorianCalendar xml =
toXMLGregorianCalendar(today);

       System.out.println("XMLGregorianCalendar
from Date in Java      : " + xml) ;

     

       //Converting
XMLGregorianCalendar to java.util.Date in Java

       Date date = toDate(xml);

       System.out.println("java.util.Date
from XMLGregorianCalendar in Java : " + date);

     

    }

  

    /*

     * Converts
java.util.Date to javax.xml.datatype.XMLGregorianCalendar

     */

    public static XMLGregorianCalendar toXMLGregorianCalendar(Date date){

        GregorianCalendar gCalendar = new GregorianCalendar();

        gCalendar.setTime(date);

        XMLGregorianCalendar xmlCalendar = null;

        try {

            xmlCalendar = DatatypeFactory.newInstance().newXMLGregorianCalendar(gCalendar);

        } catch (DatatypeConfigurationException ex) {

            Logger.getLogger(StringReplace.class.getName()).log(Level.SEVERE, null, ex);

        }

        return xmlCalendar;

    }

  

    /*

     * Converts
XMLGregorianCalendar to java.util.Date in Java

     */

    public static Date toDate(XMLGregorianCalendar calendar){

        if(calendar == null) {

            return null;

        }

        return calendar.toGregorianCalendar().getTime();

    }

  

}

Output:

XMLGregorianCalendar from Date in Java           : 2013-01-27T23:45:23.322-04:30

java.util.Date from XMLGregorianCalendar in Java : Sun Jan 27 23:45:23 VET 2013

Important
point to note:

Few points which is worth knowing while converting XMLGregorianCalendar
to Date in Java.

1) XML Schema has different data type for date, time and dateTime e.g. xsd:date, xsd:time and xsd:dateTime, By
default JAXB XJC maps all these to XMLGregorianCalendar in Java.

2) It's possible to customize XJC to generate Date
instead of XMLGregorianCalendar for xs:date, xs:time and xs:dateTime data
types. I will write about that later, but you can still explores this option.

3) While creating instance of GregorianCalendar, its
better to use constructor
instead calling GregorianCalendar.getInstance() because
it's similar to Calendar.getInstance() and can return different
type of Calendar based upon Locale settings e.g. BuddhistCalendar for Thai
locale or JapaneseImperialCalendar for Japan.
By using constructor, you also removes type casting because getInstance() return
instance of java.util.Calendar, and prevents ClassCastException
in Java.

That's all on How to convert XMLGregorianCalendar to Date in Java and
Date to XMLGregorianCalendar. Sometimes, it also helps to keep things
simply by using formatted
String to represent date and time in XML files and later convert
String to Date in Java program.

Source:http://javarevisited.blogspot.com/2013/02/convert-xmlgregoriancalendar-to-date-xmlgregoriancalendar-java-example-tutorial.html