Cumulative measure that stops at 12 months

[Syk]

Hey there!
I have a cumulative measure written as such:

Cumulative measure = 
VAR firstvisibledate =
    MIN ( fact_Economic_Details[Production_Date] )
VAR lastvisibledate =
    MAX ( fact_Economic_Details[Production_Date] )
VAR lastproddate =
    CALCULATE (
        MAX ( fact_Economic_Details[Production_Date] ),
        REMOVEFILTERS ()
    )
VAR result =
    IF (
        firstvisibledate <= lastproddate,
        CALCULATE (
            [Gross Production Volume], --this is a basic sum calculation
            'dim_Date'[Date] <= lastvisibledate
        )
    )
RETURN
    result

I want to get the value of this measure at the 12 month mark. Any idea how to implement this?

[Greg_Deckler]

@Syk So 12 months in the past or for the last 12 months only? Maybe something like this?

Last 12 Months = 
  VAR __Today = TODAY()
  VAR __12MonthsAgo = EOMONTH( __Today, -12)
  VAR __MinDate = DATE(YEAR(__12MonthsAgo), MONTH(__12Months), 1)
  VAR __Table = SUMMARIZE( 'fact_Economic_Details',[Production_Date], "__Value", [Cumulative measure])
  VAR __Result = SUMX(__Table, [__Value])
RETURN
  __Result

[Syk]

The cumulative measure that I have starts at the first month of production (for a given entity). I need the first 12 months of production. The date ranges will be different for each entity as they start producing at different dates.