List the changes files between 2 dates on specific branch

Kapila Kohli <[email protected]>
Newsgroups gmane.comp.version-control.cvs.general
Message-ID <[email protected]>
Hi,
 I am trying to  find filter diff on basis of dates on a particular branch-
with
 cvs diff  -s -rEngine-Decouple:31-mar-2009 -rEngine-Decouple:13-may-2009
orion
or
cvs diff  -s -D 31-mar-2009 -D 13-may-2009 orion/build.xml.aff.prod

but not getting the right o/p.Can any1 help?
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