The steps below are demonstrated in the attached workbook.

1. Select Analysis > Create Calculated Field. 
2. Name the calculated field "1 Year Ago".
3. Enter the following calculation:

   DATEADD('year', -1, TODAY())

4. Click OK.
5. Select Analysis > Create Calculated Field.
6. Name the calculated field "Date Trunc".
7. Enter the following calculation:

   DATETRUNC('month', DATEADD('year', -1, TODAY())

8. Click OK.
9. Select Analysis > Create Calculated Field.
10. Name the calculated field "Date Filter".
11. Enter the following calculation:

    [Order Date] <= [1 Year Ago] AND [Order Date] >= [Date Trunc]

12. Click OK.
13. Drag the Date Filter calculated field to the Filters shelf.
14. Select True and click OK.