SSIS expression to find previous Friday

Question

Using SQL Server 2008, I have built an SSIS variable with dynamic value base on current date. I would like to have its value to be Friday if the current day is Monday, and h

Answer 1

Will this work (you can substitute GETDATE() for @date, I just used that to easily test out different dates)

DECLARE @date DATETIME
SET @date = '2013-01-14'

SELECT
    PrevFriday = CASE WHEN DATEPART(weekday, @date) <> 2 THEN @date
                      ELSE DATEADD(DAY, -3, @date)
                 END

UPDATE: Here is same, but done in SSIS Variable Expression:

DATEPART("dw", GETDATE()) != 2?
GETDATE():
DATEADD("dw", -3, GETDATE())

UPDATE #2: Here is how to return the previous Friday for ANY date, not just Monday

SELECT DATEADD(DAY, -1 - (DATEPART(weekday, @date) % 7), @date)