This is some example code I wrote to play with the "time" aspect of Datomic.
http://finecode.net/blog/2012/03/08/versioning-datomic/
Download the Datomic peer library.
Install to your local maven repository:
mvn install:install-file -DgroupId=com.datomic -DartifactId=datomic -Dfile=datomic-0.1.2753.jar -DpomFile=pom.xml
Copyright © 2012 Jeff Dik
Distributed under the Eclipse Public License, the same as Clojure.