http://svn.haxx.se/dev/archive-2003-08/1096.shtml

Date: 2003-08-21 00:33:37 CEST

james-tigris@jrv.org wrote:

>I'm trying to write a program to import from old PVCS files into SVN
>and retain the authorship and timestamps.
>
>I'm wondering if doing a propset of svn:date is going to really do
>what I want, which is to allow me to retrieve an entire project as of
>a particular date. The files are being committed one by one, revision
>by revision from the original PVCS archives
>
You must be very, very careful when changing svn:date. At the moment,
SVN assumes that commit dates increase monotonically with revision
numbers. So, while it's possible to change svn:date, braking this
assumption would mean that the -r{date} option would not work reliably
any more.

Yes, we have A Plan to remove this restriction in future.