Measure month prior to selected month in DAX

Question

Range_Selling_Count =
VAR SelectedDateRange =
    DATESBETWEEN(
        'Calendar'[Date],
        MIN('Calendar'[Date]),
        MAX('Calendar'[Date])
    )
RETURN
CALCULATE(
    DISTINCTCOUNT('Data'[Store Code]),
    FILTER(
        ALL('Data'[Store Code]),
        CALCULATE(
            DISTINCTCOUNT('Data'[SKU NAME NEW]),
            'Data'[SKU NAME NEW] IN {"ED 250 ML", "Sugar Free", "4 Pack"},
            'Calendar'[Date] IN SelectedDateRange
        ) >= 2
    )
)

Using this measure for the selected month, but I need another measure for the same period last month.