cvs diff --ifdef acts like -D date

[Robert Smith]

The command
cvs diff --ifdef=SYMBOL

Gives the error:

cvs [server aborted]: Can't parse date/time: SYMBOL

As if I had typed: cvs diff -D SYMBOL

Background: 
diff -D SYMBOL and --ifdef=SYMBOL both do the same thing but
cvs diff -D expects a date and is a cvs specific command.

System: Mac OS 10.2.6
cvs --version:
> 
> Concurrent Versions System (CVS) 1.10 `Halibut' (client/server)
> 
> Copyright (c) 1989-1998 Brian Berliner, david d `zoo' zuhn,
>                       Jeff Polk, and other authors

ls -l /usr/bin/cvs 
>-rwxr-xr-x  1 root  wheel  544756 May 29 11:43 /usr/bin/cvs

-- 
Robert G. Smith
301-594-8086 work
703-328-5968 cell
rsmith@ncbi.nlm.nih.gov