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SELECT DATEADD(mm, DATEDIFF(mm,0,getdate()), 0) 
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SELECT DATEADD(wk, DATEDIFF(wk,0,getdate()), 0)
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SELECT DATEADD(yy, DATEDIFF(yy,0,getdate()), 0)
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SELECT DATEADD(qq, DATEDIFF(qq,0,getdate()), 0)
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SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(mm,0,getdate()), 0))
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SELECT dateadd(ms,-3,DATEADD(yy, DATEDIFF(yy,0,getdate()), 0))
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SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+1, 0))
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select DATEADD(wk, DATEDIFF(wk,0,                                      
                    dateadd(dd,6-datepart(day,getdate()),getdate())    
                                                                ), 0)    
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SELECT dateadd(ms,-3,DATEADD(yy, DATEDIFF(yy,0,getdate())+1, 0))¡£
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SELECT CONVERT(varchar(30),getdate(),101) now
 101  mm/dd/yy 
102   yy-mm-dd
103   dd/mm/yy
104   dd-mm-yy
105  dd-mm-yy
106  dd mon yy 
107   mon dd,yy 
108   hh:mm:ss 
9 or 109  mon dd yyyy hh:mi:ss:mmmmAM(»òPM)
 110   mm-dd-yy 
  111   yy/mm/dd 
  112   yymmdd 
  13 or 113   dd mon yyyy hh:mi:ss:mmm(24СʱÖÆ) 
114   hh:mi:ss:mmm(24СʱÖÆ) 
20 or 120 | yyyy-mm-dd hh:mi:ss(24СʱÖÆ) 
21 or 121 | yyyy-mm-dd hh:mi:ss:mmm(24СʱÖÆ)


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