I just changed the implementation of the 'cron' expression in
OpenWFEru (the workflow and BPM engine, not in the Rufus::Scheduler).
I wrote something about it :
http://jmettraux.wordpress.com/2008/03/21/changes-for-the-cron-expression/
This change is part of the upcoming 0.9.18 (or 1.0.0) release.
Have a nice week-end,
John