1Dateadd(wk,datediff(wk,0,getdate()),-1)

2Dateadd(wk,datediff(wk,0,getdate()),6)

3

4Dateadd(mm,datediff(mm,0,getdate()),0)

5Dateadd(ms,-3,dateadd(mm,datediff(m,0,getdate())+1,0))

6

7Dateadd(yy,datediff(yy,0,getdate()),0)

8Dateadd(ms,-3,DATEADD(yy, DATEDIFF(yy,0,getdate())+1, 0))