A more interesting question than I expected! Clozure's more or less official announcement was on October 19th, 2007. ( http://article.gmane.org/gmane.lisp.mcl.

A more interesting question than I expected! Clozure's more or less official announcement was on October 19th, 2007. ( http://article.gmane.org/gmane.lisp.mcl.general/2593 http://article.gmane.org/gmane.lisp.mcl.general/2593 ) Clojure was released on October 17th, 2007. ( http://groups.google.com/group/clojure/msg/16fec21eb1fff8aa http://groups.google.com/group/clojure/msg/16fec21eb1fff8aa ) Of course Clozure is much older if you look at the code and not just the name.