The XSD date/time types need work before we can fully validate their values. This Jira issue will be used for that work. Note: I just discovered the following links of interest: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4959151 http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/datatype/XMLGregorianCalendar.html http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/datatype/Duration.html