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

It should be noted that the issue with Sundays appears to no longer be present at least as of MSSQL 2012. Both the simple solution

SELECT DATEADD(wk, DATEDIFF(wk, 6, @input), 0)

and the complex one

SELECT DATEADD(wk, DATEDIFF(wk, 6, 
CASE DATEPART(dw,@input)
WHEN 1 THEN DATEADD(d,-1,@input)
ELSE @input
END
), 0)

return the same for any date that I've tried, including Sundays.