ah yes. Datejs -- almost forgot about it. :">
i played with that at the start of the year, and it's indeed a very powerful js date manipulation library. plus it's lightweight -- 9kb for the core functions, and 29kb for the full package.
one of the authors provided useful Datejs-ExtJS integration info in this thread:
http://groups.google.com/group/datej...43b2eb7372405c

