获取当前日期所在的周五的日期

默认第一天是周日：

 

 

declare @FridayDate datetime

if (DATENAME(dw, getdate()) = 'Sunday')
 select @FridayDate = DATEADD(wk, DATEDIFF(wk,0,getdate()), -3)
else
 select @FridayDate = DATEADD(wk, DATEDIFF(wk,0,getdate()), 4)

select @FridayDate