Listing the commit messages for a single day

Hi,

I was trying to find a way to list the commit messages for a single
day in a repo. I found something using log but the result is
unexpected. I wanted to find the commit messages for today 27-12-2009,
so I did:
$ svn --non-interactive -r{2009-12-27}:{2009-12-28} log
------------------------------------------------------------------------
r505 | pocm06r | 2009-12-20 11:10:52 +0000 (Sun, 20 Dec 2009) | 1 line

Presentation of ICFEM09
------------------------------------------------------------------------
r506 | pocm06r | 2009-12-27 09:34:29 +0000 (Sun, 27 Dec 2009) | 1 line

TAP10 initial commit
------------------------------------------------------------------------
r507 | pocm06r | 2009-12-27 09:38:12 +0000 (Sun, 27 Dec 2009) | 1 line

Thesis bits and pieces.
------------------------------------------------------------------------

I guess taking the commit messages from this output is simple. What I
can't understand is why a commit from 2009-12-20 is showing up. Any
tips?

Cheers,

-- 
Paulo Jorge Matos - pocmatos at gmail.com
http://www.pmatos.net