DECLARE @startDate DATE = '2012-01-01', @endDate DATE = '2012-12-31';

WITH CTE(N) AS (SELECT 1 FROM (VALUES(1),(1),(1),(1),(1),(1),(1),(1),(1),(1))a(N)),
CTE2(N) AS (SELECT 1 FROM CTE x CROSS JOIN CTE y),
CTE3(N) AS (SELECT 1 FROM CTE2 x CROSS JOIN CTE2 y),
CTE4(N) AS (SELECT 1 FROM CTE3 x CROSS JOIN CTE3 y),
CTE5(N) AS (SELECT 1 FROM CTE4 x CROSS JOIN CTE4 y),
CTE6(N) AS (SELECT 0 UNION ALL
            SELECT TOP (DATEDIFF(day,@startDate,@endDate)) 
            ROW_NUMBER() OVER(ORDER BY (SELECT NULL))
            FROM CTE5),
TALLY(N) AS (SELECT DATEADD(day, N, @startDate)
             FROM CTE6
             WHERE DATENAME(weekday,DATEADD(day, N, @startDate)) = 'Monday')
SELECT N
FROM TALLY
ORDER BY N;