How do I use cvs to compare two points in time on a branch?

Question

I can use something like: cvs.exe rdiff -D2010-03-23 -D2010-03-24 -s "ProjectName" to get the changes which occurred on the 23rd.

But I want to get the changes that were checked in on the 23rd on a specified branch - and if I add in a -v branchv1-0-0-0 into that it tells me I can't have more than two dates/revisions in one query.

Any suggestions?