What to include in WHERE clause to show previous week of data

Question

I'm writing a stored procedure for an SSRS report and one of the criteria is to show the data from the previous week. I've tried multiple different things in my WHERE clause to show the previous week and I can't find one that returns any records.

I've tried Datepart (w,-1,st.startdate), DATEDIFF, DATEPART(WEEK, GETDATE() - 7) and others, below is what I'm currently trying which also does not return any records.

DECLARE @EndDate    DATETIME

SET @StartDate  = DATEADD(DAY, DATEDIFF(DAY, 7, GETDATE()), 0)
SET @EndDate    = GETDATE()

    SELECT  sfd.SalesForecastID,
            sf.StartDate,
            sf.EndDate, 
            sf.[Description],
            CASE
                WHEN sf.StatusID = 1 THEN 'Open'
                WHEN sf.StatusID = 2 THEN 'Closed'
            END AS 'Status',
            pm.Generic,
            pm.SubGeneric,
            pm.SKU AS 'PartNumber', 
            sfd.ProposedVolume,
            sfd.EstimatedValue,
            sfd.MonthlyRunRate,
            sfd.ProductNotes
    FROM    [ForestDBDev].[dbo].[SalesForecastDetail] sfd
    INNER JOIN  [ForestDBDev].[dbo].[SalesForecast] sf      ON sf.SalesForecastID = sfd.SalesForecastID
    INNER JOIN  dbo.OrdPart op                              ON op.OrdPart_ID      = sfd.PartID          COLLATE DATABASE_DEFAULT
    INNER JOIN  [ForestDBDev].[ProductDB].[PartMaster] pm   ON op.PartNum         = pm.SKU              COLLATE DATABASE_DEFAULT
    WHERE sf.CreatedDate BETWEEN @StartDate AND @EndDate