First day and last day of a week

create procedure usp_first_day_and_last_day_of_week(@y as int,@w as int)
as begin
--Kamel Gazzah 12/10/2015
--kamelgazzah@gmail.com
declare @fd as datetime
set @fd='01/01/'+convert(varchar(4),@y)
select @w "week",dateadd(day,8+7*(@w-2)-datepart(weekday,@fd),@fd)"first day",dateadd(day,14+7*(@w-2)-datepart(weekday,@fd),@fd)"last day"
end