java util Date to XMLGregorianCalendar

Question

Isn t there a convenient way of getting from a java util Date to a XMLGregorianCalendar

User · Answer

A one line example using Joda-Time library:

XMLGregorianCalendar xgc = DatatypeFactory.newInstance().newXMLGregorianCalendar(new DateTime().toGregorianCalendar());

Credit to Nicolas Mommaerts from his comment in the accepted answer.

User · Answer

I should like to take a step back and a modern look at this 10 years old question  The classes mentioned  Date and XMLGregorianCalendar  are old now  I challenge the use of them and offer alternatives    Date was always poorly designed and is more than 20 years old  This is simple  don   t use it  XMLGregorianCalendar is old too and has an old-fashioned design  As I understand it  it was used for producing dates and times in XML format for XML documents  Like 2009-05-07T19 05 45 678 02 00 or 2009-05-07T17 05 45 678Z  These formats agree well enough with ISO 8601 that the classes of java time  the modern Java date and time API  can produce them  which we prefer    No conversion necessary  For many  most   purposes the modern replacement for a Date will be an Instant  An Instant is a point in time  just as a Date is        Instant yourInstant              System out println yourInstant     An example output from this snippet      2009-05-07T17 05 45 678Z   It   s the same as the latter of my example XMLGregorianCalendar strings above  As most of you know  it comes from Instant toString being implicitly called by System out println  With java time  in many cases we don   t need the conversions that in the old days we made between Date  Calendar  XMLGregorianCalendar and other classes  in some cases we do need conversions  though  I am showing you a couple in the next section    Controlling the offset  Neither a Date nor in Instant has got a time zone nor a UTC offset  The previously accepted and still highest voted answer by Ben Noland uses the JVMs current default time zone for selecting the offset of the XMLGregorianCalendar  To include an offset in a modern object we use an OffsetDateTime  For example       ZoneId zone   ZoneId of  America Asuncion        OffsetDateTime dateTime   yourInstant atZone zone  toOffsetDateTime        System out println dateTime        2009-05-07T13 05 45 678-04 00   Again this conforms with XML format  If you want to use the current JVM time zone setting again  set zone to ZoneId systemDefault     What if I absolutely need an XMLGregorianCalendar   There are more ways to convert Instant to XMLGregorianCalendar  I will present a couple  each with its pros and cons  First  just as an XMLGregorianCalendar produces a string like 2009-05-07T17 05 45 678Z  it can also be built from such a string       String dateTimeString   yourInstant toString        XMLGregorianCalendar date2               DatatypeFactory newInstance   newXMLGregorianCalendar dateTimeString       System out println date2        2009-05-07T17 05 45 678Z   Pro  it   s short and I don   t think it gives any surprises  Con  To me it feels like a waste formatting the instant into a string and parsing it back       ZonedDateTime dateTime   yourInstant atZone zone       GregorianCalendar c   GregorianCalendar from dateTime       XMLGregorianCalendar date2   DatatypeFactory newInstance   newXMLGregorianCalendar c       System out println date2        2009-05-07T13 05 45 678-04 00   Pro  It   s the official conversion  Controlling the offset comes naturally  Con  It goes through more steps and is therefore longer   What if we got a Date   If you got an old-fashioned Date object from a legacy API that you cannot afford to change just now  convert it to Instant       Instant i   yourDate toInstant        System out println i     Output is the same as before      2009-05-07T17 05 45 678Z   If you want to control the offset  convert further to an OffsetDateTime in the same way as above   If you   ve got an old-fashioned Date and absolutely need an old-fashioned XMLGregorianCalendar  just use the answer by Ben Noland   Links   Oracle tutorial  Date Time explaining how to use java time  XSD Date and Time Data Types on W3Schools  Wikipedia article  ISO 8601

User · Answer

GregorianCalendar c   new GregorianCalendar    c setTime yourDate   XMLGregorianCalendar date2   DatatypeFactory newInstance   newXMLGregorianCalendar c

User · Answer

Assuming you are decoding or encoding xml and using JAXB  then it s possible to replace the dateTime binding entirely and use something else than  XMLGregorianCalendar  for every date in the schema   In that way you can have JAXB do the repetitive stuff while you can spend the time on writing awesome code that delivers value   Example for a jodatime DateTime    Doing this with java util Date would also work - but with certain limitations  I prefer jodatime and it s copied from my code so I know it works       lt jxb globalBindings gt       lt jxb javaType name  org joda time LocalDateTime  xmlType  xs dateTime          parseMethod  test util JaxbConverter parseDateTime          printMethod  se seb bis test util JaxbConverter printDateTime    gt       lt jxb javaType name  org joda time LocalDate  xmlType  xs date          parseMethod  test util JaxbConverter parseDate          printMethod  test util JaxbConverter printDate    gt       lt jxb javaType name  org joda time LocalTime  xmlType  xs time          parseMethod  test util JaxbConverter parseTime          printMethod  test util JaxbConverter printTime    gt       lt jxb serializable uid  2    gt   lt  jxb globalBindings gt    And the converter   public class JaxbConverter   static final DateTimeFormatter dtf   ISODateTimeFormat dateTimeNoMillis    static final DateTimeFormatter df   ISODateTimeFormat date    static final DateTimeFormatter tf   ISODateTimeFormat time     public static LocalDateTime parseDateTime String s        try           if  StringUtils trimToEmpty s  isEmpty                return null          LocalDateTime r   dtf parseLocalDateTime s           return r        catch  Exception e            throw new IllegalArgumentException e            public static String printDateTime LocalDateTime d        try           if  d    null              return null          return dtf print d         catch  Exception e            throw new IllegalArgumentException e            public static LocalDate parseDate String s        try           if  StringUtils trimToEmpty s  isEmpty                return null          return df parseLocalDate s         catch  Exception e            throw new IllegalArgumentException e            public static String printDate LocalDate d        try           if  d    null              return null          return df print d         catch  Exception e            throw new IllegalArgumentException e            public static String printTime LocalTime d        try           if  d    null              return null          return tf print d         catch  Exception e            throw new IllegalArgumentException e            public static LocalTime parseTime String s        try           if  StringUtils trimToEmpty s  isEmpty                return null          return df parseLocalTime s         catch  Exception e            throw new IllegalArgumentException e             See here   how replace XmlGregorianCalendar by Date   If you are happy to just map to an instant based on the timezone timestamp  and the original timezone is not really relevant  then java util Date is probably fine too

User · Answer

For those that might end up here looking for the opposite conversion  from XMLGregorianCalendar to Date    XMLGregorianCalendar xcal    lt assume this is initialized gt   java util Date dt   xcal toGregorianCalendar   getTime

User · Answer

Here is a method for converting from a GregorianCalendar to XMLGregorianCalendar  I ll leave the part of converting from a java util Date to GregorianCalendar as an exercise for you   import java util GregorianCalendar   import javax xml datatype DatatypeFactory  import javax xml datatype XMLGregorianCalendar   public class DateTest       public static void main final String   args  throws Exception         GregorianCalendar gcal   new GregorianCalendar          XMLGregorianCalendar xgcal   DatatypeFactory newInstance                newXMLGregorianCalendar gcal         System out println xgcal             EDIT  Slooow   -

User · Answer

Check out this code  -     Create Date Object    Date date   new Date    XMLGregorianCalendar xmlDate   null  GregorianCalendar gc   new GregorianCalendar     gc setTime date    try      xmlDate   DatatypeFactory newInstance   newXMLGregorianCalendar gc     catch Exception e       e printStackTrace       System out println  XMLGregorianCalendar  -     xmlDate     You can see complete example here

User · Answer

I hope my encoding here is right  D To make it faster just use the ugly getInstance   call of GregorianCalendar instead of constructor call   import java util GregorianCalendar  import javax xml datatype DatatypeFactory  import javax xml datatype XMLGregorianCalendar   public class DateTest       public static void main final String   args  throws Exception            do not forget the type cast          GregorianCalendar gcal    GregorianCalendar  GregorianCalendar getInstance          XMLGregorianCalendar xgcal   DatatypeFactory newInstance                newXMLGregorianCalendar gcal         System out println xgcal

User · Answer

Just thought I d add my solution below  since the answers above did not meet my exact needs  My Xml schema required seperate Date and Time elements  not a singe DateTime field  The standard XMLGregorianCalendar constructor used above will generate a DateTime field  Note there a couple of gothca s  such as having to add one to the month  since java counts months from 0    GregorianCalendar cal   new GregorianCalendar    cal setTime yourDate   XMLGregorianCalendar xmlDate   DatatypeFactory newInstance   newXMLGregorianCalendarDate cal get Calendar YEAR   cal get Calendar MONTH  1  cal get Calendar DAY OF MONTH   0   XMLGregorianCalendar xmlTime   DatatypeFactory newInstance   newXMLGregorianCalendarTime cal get Calendar HOUR OF DAY   cal get Calendar MINUTE   cal get Calendar SECOND   0

[java] java.util.Date to XMLGregorianCalendar

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