Amount from previous years with same period

[Anonymous]

Hello everyone.

I try to calculate the amount of previous year with same day.

An example, we are the 03/02/2017, i want the amount between 01/01/2016 and 03/02/2016.

I try with different function :

LastYearMT = VAR 
    CurrentDate = NOW()
  RETURN
    CALCULATE( 
     SUM(Ventes[Montant]); 
     YEAR(Ventes[DATE]) = YEAR(CurrentDate)-1;MONTH(Ventes[DATE])<MONTH(CurrentDate)+1)

LastYearMT02 = VAR 
    CurrentPeriod = DATEDIFF(Date(Year(Now());1;1);now();DAY) RETURN
    CALCULATE( 
     SUM(Ventes[Montant]); 
    DATEDIFF(Date(Year(Now());1;1);Ventes[DATE];DAY)<=CurrentPeriod)

And now the result :

Have you some issues ?

Thank you so much.