month of week of first day and last date using sqlserver

declare @end_week datetime,@week_number int
declare @start_week datetime,@today datetime
set @today=GETDATE()
set @week_number=2
set @today = dateadd(wk, @week_number- datepart(wk,@today), @today)
set @start_week = dateadd(d, 1 - DATEPART(dw, @today), @today)
set @end_week = dateadd(d,6,@start_week )
select @start_week,@end_week