Determining revision usisng a date

I'm trying to merge some old code into a new WC. I tried passing the
-D sub-argument to the diff command, but was greated with the
following error message (I'm using a fairly old client):

   ra_dav does not currently support date-based operations.

How do I determine which trunk revision corresponds to some code I
made modifications to on July 31, 2002?

-- 
Daniel Rall <dlr@finemaltcoding.com>
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