Convert between LocalDate and XMLGregorianCalendar

Question

What's the best way to convert between LocalDate from Java 8 and XMLGregorianCalendar?

Answer 1

Converting from LocalDate to XMLGregorianCalendar:

LocalDate date = LocalDate.now(); GregorianCalendar gcal = GregorianCalendar.from(date.atStartOfDay(ZoneId.systemDefault())); XMLGregorianCalendar xcal = DatatypeFactory.newInstance().newXMLGregorianCalendar(gcal); 

Converting back is simpler:

xcal.toGregorianCalendar().toZonedDateTime().toLocalDate(); 

Answer 2

The LocalDate stores only year/month/day information. There is no time nor time-zone information in it. The XMLGregorianCalendar stores date (year/month/day) + optionally time and optionally time zone information.

So converting from LocalDate to XMLGregorianCalendar is simple:

LocalDate in; XMLGregorianCalendar out; in = LocalDate.parse("1999-11-11"); out = DatatypeFactory.newInstance().newXMLGregorianCalendar(in.toString()); 

Converting from XMLGregorianCalendar to LocalDate might be not so simple, because XMLGregorianCalendar may have time and time-zone information which you simply can't store in LocalDate.

However, I guess that if you are converting from XMLGregorianCalendar to LocalDate then the XMLGregorianCalendar is resulting from a nontimezoned xsd:date element (represented as YYYY-MM-DD in the xml). In that case you should convert it like this:

XMLGregorianCalendar in; LocalDate out; in = DatatypeFactory.newInstance().newXMLGregorianCalendar("2011-11-11"); out = LocalDate.parse(in.toXMLFormat()); 

Whole example:

    {         LocalDate in;         XMLGregorianCalendar out;         in = LocalDate.parse("1999-11-11");         out = DatatypeFactory.newInstance().newXMLGregorianCalendar(in.toString());         System.out.println("in: " + in.toString());         System.out.println("out: " + out.toXMLFormat());     }     {         XMLGregorianCalendar in;         LocalDate out;         in = DatatypeFactory.newInstance().newXMLGregorianCalendar("2011-11-11");         out = LocalDate.parse(in.toXMLFormat());         System.out.println("in: " + in.toXMLFormat());         System.out.println("out: " + out.toString());     }