checkout by date gives wrong version of repo

Hi all,

I'm trying to study the evolution of ant and I'm doing checkouts of
ant's svn repo in three month increments. I have been checking out
with:

svn co --revision {2008-7-1}
http://svn.apache.org/repos/asf/ant/core/trunk/ foobar

For appropriate dates. This seems to work until I get before
2006-1-1. If I give it any date prior to that, I get the repo as of
that date. I know by browsing their repo online, that changes were
being made prior to that.
Also, I can browse the online ant repo and find the revision closest
to a date I want and check it out by revision number and things work
correctly. So if I do

svn co --revision 320000 http://svn.apache.org/repos/asf/ant/core/trunk/ foobar2

Then it checks out correctly the repository for the revision 320000 at
the date that is indicated by browsing the online repo. I could try
to find a way to find the actual revision number associated with each
date, but I'd really like to specify a date for checkout and have it
work correctly. Has anyone seen anything like this before? I'd
really appreciate any tips/hints/etc.

I'm using svn 1.5.2 in case that helps. Thanks!

-- Chris

-- 
Christian Bird
cabird_at_gmail.com
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