Craig Farrell (11/3/2010)
It manipulates DATEFIRST and you might botch something up on your real servers if you run it.
Setting DATEFIRST in a query only affects the session, not the entire server... which is also why I don't understand why people are afraid to write queries that rely on a particular @@DATEFIRST query.
--Jeff Moden
Change is inevitable... Change for the better is not.