Joda-time isn't quite a standard, but most folks reckon that it is the best library for managing dates and times in the JVM. As of this writing, Querki uses it a bit internally; eventually, we hope to expose the full power of Joda-time to the QL language, so that you can do everything you want to dates and times.
In order to make use of Joda-time, we use the nscala-time wrapper around it. This is a straightforward but useful project, that makes Joda-time easy to use from Scala code.
