Beginning date of any week in a year

August 9, 2004

>>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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