Rolling window in chart

Hi, 

Agreed that Power Query would be a better approach. I'd normally use Melissa de korte's Date table function in PQ and it's very customizable. 

https://gist.github.com/m-dekorte/12b53faee9cc1a616fa23f15b1b4a173 

But if you insist on using DAX for this task, complete your logic as below and apply a visual-level filter Flag = 1

CalendarTable = 
VAR CurrentYear = YEAR(TODAY())
RETURN
ADDCOLUMNS(
    CALENDAR(DATE(CurrentYear-1,1,1), DATE(CurrentYear,12,31)),
    "Year", YEAR([Date]),
    "Month", FORMAT([Date], "MMMM"),
    "MonthNumber", MONTH([Date]),
    "Quarter", "Q" & QUARTER([Date]),
    "YearQuarter", YEAR([Date]) & " Q" & QUARTER([Date]),
    "QuarterStart", DATE(YEAR([Date]), (QUARTER([Date])-1)*3 + 1, 1),
    "Flag",
        VAR _currentQStart = DATE(YEAR(TODAY()), (QUARTER(TODAY())-1)*3 + 1, 1)
        VAR _dateQStart = DATE(YEAR([Date]), (QUARTER([Date])-1)*3 + 1, 1)
        RETURN
            IF(
                _dateQStart <= _currentQStart &&
                _dateQStart >= EDATE(_currentQStart, -9),  
                1,
                0
            )
)