Beginning date of any week in a year

>>Script Language and Platform: SQL Server 2000

For a given year and week, this function will return the date of the first day of that week.

Usage:

select dbo.udf_mondayofaweek(1,2001)

–results

2001-01-01 00:00:00.000

select dbo.udf_mondayofaweek(22,2003)

–results

2003-05-26 00:00:00.000

Author: MAK

set datefirst 1

go

Create function dbo.udf_Mondayofaweek(

@week int,

@year varchar(4))

returns datetime

as

begin

declare @date varchar(10)

declare @firstdayofweek datetime

set @date=’01/01/’+@year

set @date =convert(varchar(10),convert(datetime,@date)

  – (datepart(dw,@date)-1),101)

set @firstdayofweek =dateadd(ww,@week-1,@date)

return @firstdayofweek

end

go

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