[ericevans]

It is interesting that many of the comments have suggested that JodaTime does what a "normal person" would expect in most of these odd cases, whereas you are pointing out that advanced mathematical concepts can define an algebra where associativity doesn't apply. Almost opposite points! But well taken.

One thing though: I think I was clear that I like Joda Time. It does handle these things better than most libraries. That is what makes it interesting to discuss. I could write a fun article picking apart some awful library, such as the old Java default library, but what would be the point.