SQL Convert Week Number to Date (dd/MM)

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Try this,

declare @wk int  set @wk = 21
declare @yr int  set @yr = 2016

select dateadd (week, @wk-1, dateadd (year, @yr-1900, 0)) - 4 -
       datepart(dw, dateadd (week, @wk-1, dateadd (year, @yr-1900, 0)) - 4) + 1

or try this way

declare @wk int  = 21

select dateadd(week,@wk-1, DATEADD(wk, DATEDIFF(wk,-1,DATEADD(yy, DATEDIFF(yy,0,getdate()), 0)), 0))

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