last quarter and next quarter

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SELECT DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) - 1, 0)-- First day of last quarter
SELECT DATEADD(dd, -1, DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0))-- Last day of last quarter
SELECT DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) + 1, 0)-- First day of Next quarter
SELECT DATEADD (dd, -1, DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) +2, 0))-- Last day of Next quarter