Description of problem: I would expect date -d "July 2005" to return something like "Fri Jul 1 00:00:00 BST 2005" or complain that format is invalid. However for some unknown reason it actually returns "Mon Dec 26 00:00:00 GMT 2011". The error seems to be constant number of days out. Version-Release number of selected component (if applicable): coreutils-5.2.1-48.1 However, it seems to have been broken for a long time - sh-utils-2.0.11-5.2 on RHEL 2.1 has the same behaviour.
It seems "July 2005" is actually giving the 2005th day of July this (32nd July=1st August etc.). I have now checked this on the Fedora Core 5 beta, and that reports an error with such date formats.