Joda-Time 0.95, an open source class library for date and time manipulation and formatting more sophisticated than java.util.DateFormat, has been posted. "The 'default' calendar system implemented will be the ISO8601 standard. This specifies a framework for date and time independent of locale. Thus, in the standard, the first day of the week is Monday, and this has the index 1. This avoids any ambiguity across national boundaries.
Additional calendar systems supported are Gregorian, Julian, GregorianJulian (GJ) and Buddhist. The design is flexible and pluggable, so adding additional calendar systems should be easy. "