What's the most efficient way to calculate the first day of the current (Australian) Financial Year?
The Australian FY begins on 01-July.
E.g.
SELECT dbo.FinancialYearStart('30-Jun-2011') returns 01-Jul-2010.
SELECT dbo.FinancialYearStart('01-Jul-2011') returns 01-Jul-2011.
SELECT dbo.FinancialYearStart('02-Jul-2011') returns 01-Jul-2011.