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))（出处：源码网）
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