svn log unexpected result

i have a question about the svn log command. Im wondering why im getting log messages that is not within the date range i requested. Below i have the command i execute and the returned results. My request is to see revisions between 12-9-2004 at 3:00 pm and 4:23 pm. The results im getting back is my last update back on December 3rd. Should i be doing something differently, my expectation would be that i wouldnt get any log messages. Is this a wrong assumption or is there another way to get my desired results?

thank you

C:\>"svn" log --non-interactive -v --username "test" --password "test" -r "{2004-12-09 15:00:05}:{2004-12-09 16:23:35}" http://subversionurl/svn/oss/nmsRelease/trunk
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r16 | sdavey | 2004-12-03 17:42:57 -0500 (Fri, 03 Dec 2004) | 1 line
Changed paths:
   M /nmsRelease/trunk/nms-prov/src/ncss/temp/XMLHelper.java

update sample response xml
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Received on Fri Dec 10 18:20:02 2004