svn log -r {DATE:HEAD} always prints log message?

I'm trying to ask Subversion what changes have been made to a repository
since a particular date (the last time I asked it, which I'll remember).
It seems to always give me at least one log message back. Am I
misunderstanding what -r is supposed to do?

C:\isvn\local-ccnet>svn --version
svn, version 0.34.0 (r7859)
   compiled Dec 4 2003, 08:08:28

Copyright (C) 2000-2003 CollabNet.
Subversion is open source software, see http://subversion.tigris.org/

The following repository access (RA) modules are available:

* ra_dav : Module for accessing a repository via WebDAV (DeltaV) protocol.
  - handles 'http' schema
  - handles 'https' schema
* ra_local : Module for accessing a repository on local disk.
  - handles 'file' schema
* ra_svn : Module for accessing a repository using the svn network protocol.
  - handles 'svn' schema

C:\isvn\local-ccnet>svn log svn://localhost/
------------------------------------------------------------------------
r4 | mgm | 2003-12-12 17:15:50 +0000 (Fri, 12 Dec 2003) | 2 lines

Added some properties.

------------------------------------------------------------------------
r3 | mbr | 2003-12-12 17:09:44 +0000 (Fri, 12 Dec 2003) | 2 lines

Other Mike made some changes

------------------------------------------------------------------------
r2 | mgm | 2003-12-12 16:50:44 +0000 (Fri, 12 Dec 2003) | 2 lines

mgm made some changes

------------------------------------------------------------------------
r1 | (no author) | 2003-12-12 16:48:51 +0000 (Fri, 12 Dec 2003) | 1 line

added some stuff with anon user
------------------------------------------------------------------------

Now I want to find changes made since last time I asked, and I want
Subversion to give me zero output. I can't seem to persuade it though:

C:\isvn\local-ccnet>svn log -r "{2003-12-13 16:00:00}:HEAD" svn://localhost/
------------------------------------------------------------------------
r4 | mgm | 2003-12-12 17:15:50 +0000 (Fri, 12 Dec 2003) | 2 lines

Added some properties.

------------------------------------------------------------------------

C:\isvn\local-ccnet>svn log -r "{2003-12-13 16:00:00}:{2003-12-14
16:00:00}" svn://localhost/
------------------------------------------------------------------------
r4 | mgm | 2003-12-12 17:15:50 +0000 (Fri, 12 Dec 2003) | 2 lines

Added some properties.

------------------------------------------------------------------------

Am I doing something wrong here? Does svn log always show at least one
revision?

Cheers,
Mike.

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Received on Sun Dec 14 12:13:53 2003