XMLGregorianCalendar and Duration classes

I have never used this type of classes before... I stopped programming Java a long time ago :p
I have an XMLGregorianCalendar (called start_date) with the current date set, which I use to set the start of an event.
I want to set an XMLGregorianCalendar end_date that will be a copy of the first one + 1minute
There is a method addDuration() but I couldn't figure out how to use it properly :-/
I know other ways to do that, but for this case I have to use these classes...
Please if you could look at these 2 classes quickly and explain me how to do it, it would be great!
[XMLGregorian Class-> Method addDuration() documentation|http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/datatype/XMLGregorianCalendar.html#add(javax.xml.datatype.Duration)]
[Class Duration doc|http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/datatype/Duration.html]
Edited by: ierpe on Aug 7, 2008 4:58 PM

Just do
end_date = start_date.add(DatatypeFactory.newInstance().newDuration(60000L));

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