Per a brief conversation with Tom, I've created a patch for adding

Bruce Momjian <bruce@momjian.us>

Commit: 1973971821672447d30bda6f12736a7e5987569f
Author: Bruce Momjian <bruce@momjian.us>
Date: 2004-03-05T02:41:14Z
Releases: 8.0.0
Per a brief conversation with Tom, I've created a patch for adding
support for 'week' within the date_trunc function.

Within the patch I added a couple of test cases and associated target
output, and changed the documentation to add 'week' appropriately.

Robert Creager

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