From: "Martin J. Laubach" <mjl@CSlab.tuwien.ac.at>

Subject: [HACKERS] Patch: set date to euro/us postgres/iso/sql

  Here a patch that implements a SET date for use by the datetime
stuff. The syntax is

        SET date TO 'val[,val,...]'

  where val is us (us dates), euro (european dates), postgres,
iso or sql.

  Thomas is working on the integration in his datetime module.
I just needed to get the patch out before it went stale :)