DYNAMIC QUARTER MOVIL

Hi everybody

I want to create a measure that give me QUARTERL SALES, for example:

SALES1 = JAN, FEB, MAR      (IN MARCH)

SALES2 = FEB, MAR, APR      (IN APRIL)

SALES3 = MAR, APR, MAY      (IN MAY)

SALES4 = APR, MAY, JUN      (IN JUNE)

SALES 5 = MAY, JUN, JUL      (IN JULY)

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I tried this:

VAR Date1= Max(Calendar[Date])

VAR Date2 = Date1 - 1

VAR Date3 = Date1 - 2

RETURN CALCULATE([Sales];Calendar[Date]=Date1) + CALCULATE([Sales];Calendar[Date]=Date2) + CALCULATE([Sales];Calendar[Date]=Date3)

But I did not make it. I was learning using DAX