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java.time is state of the art and has been in Java for 10 years.

Before that, Joda-Time was the de facto standard, with `java.time` being a port to the standard library by the same author.

This makes it sound like joda and java.time are the same. They have major differences and java.time fixes a lot of the problems with joda time.

I use both (Joda in a legacy code base) and the similarity is clear (as the other user pointed out, both designed by the same author).

They are in part by the same author. And so is the threeten library that extend the java8 time lib with some useful-but-edgecasey additions.