unusual results with svn log

I build some nightly reports which use svn2cl as a wrapper around svn
log to send out changes. The script runs the equivalent of something
like the examples below, replacing the date with whatever is the current
date.

We are getting some situations (not all the time) where a particular
entry seems to keep showing up in the svn log messages, even when that
entry is no longer in the time range we're specifying. Is there
something wrong with the way I'm specifying the time?
 
$ svn log -v -r {"2009-09-17 00:00:00 -0700"}:{"2009-09-17 23:59:00 -0700"}
------------------------------------------------------------------------
r1 | someuser | 2009-09-15 08:28:15 -0700 (Tue, 15 Sep 2009) | 1 line

I'm not

$ svn log -v -r {"2009-09-17 00:00:00 -0700"}:{"2009-09-17 23:59:00 -0700"}
------------------------------------------------------------------------
r1011 | wby | 2009-09-15 11:12:13 -0700 (Tue, 15 Sep 2009) | 2 lines
[.....]

[below here are a bunch of other revisions that actually *is* from the
time period specified]

Currently running Subversion 1.4.6 (client & server); obviously
upgrading is the first thing I'd try, and I will do that as soon as we
have a window to upgrade our production SVN server, but curious if
anyone knows why this isn't behaving the way I'd expect it to.

w

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Received on 2009-09-18 00:58:49 CEST