Previous Monday & previous Sunday's date based on today's date

Question

I need the correct syntax to give me :

1. Previous week\'s Monday\'s date based on the current date/time using GETDATE()
2. Previous week\'s Su

Answer 1

Even better, I think, this works for any date, any week day, with any DateFirst parameter (set the first day of the week, generally 1-Monday in France, default is 7-Sunday).

create function [dbo].[previousWeekDayDate](@anyDate date, @anyWeekDay int)
returns Date
as
begin
    return DATEADD(dd, ((DATEPART(dw,@anyDate) + @@DateFirst - @anyWeekDay + 13) % 7) * -1, @anyDate)
end

works for SQL 2008, create the function and use:

SELECT dbo.previousWeekDayDate(GetDate(),1) --for Monday
SELECT dbo.previousWeekDayDate(GetDate(),7) --for Sunday