Tagging a branch for a given date

[Christopher Randall]

I am having a problem with tagging a project in my CVS repository that has been 
branched with a given date. I am trying to do the following:

cvs rtag -D "2002-2-15 17:46 PST" -r Whitney_maintenance_branch TPAS_1_1_1 
whitney

And I get the following error:

cvs [rtag aborted]: -r and -D options are mutually exclusive

So, I tried checking out along the branch, by using a specific date:

cvs checkout -D "2002-02-15 17:46 PST" -r Whitney_maintenance_branch whitney

This works just fine, but then when I try to use the "tag" command as follows, 
the MOST RECENT VERSIONS of the files on the branch are tagged, not the 
versions of the files THAT ARE IN MY LOCAL DIRECTORIES.

cvs tag -r Whitney_maintenance_branch TPAS_1_1_1

Can somebody explain this, it has been a real source of frustration for me.

Thanks,
Chris