Easiest way to populate a temp table with dates between and including 2 date parameters

Question

What is the easiest way to populate a temp table with dates including and between 2 date parameters. I only need the 1st day of the month dates.

So for example if @S

Answer 1

Correction for null dates:

IF OBJECT_ID('tempdb..#dim') IS NOT NULL 

    DROP TABLE #dim

CREATE  TABLE #dim ([date] DATE)

if not @Begin_Date is null and not @End_Date is null

begin
    INSERT #dim([date])
    SELECT d
    FROM(

      SELECT
          d = DATEADD(DAY, rn - 1, @Begin_Date)
      FROM 
      (
          SELECT TOP (DATEDIFF(DAY, @Begin_Date, @End_Date)) 
              rn = ROW_NUMBER() OVER (ORDER BY s1.[object_id])
          FROM
              sys.all_objects AS s1
          CROSS JOIN
              sys.all_objects AS s2
          ORDER BY
              s1.[object_id]
      ) AS x
    ) AS y;
end