Difference of sales and purchase for randomly selected years

[avulasandeep]

Hi everyone,

Need help regarding the difference of sales and purchase for randomly selected months or years but here difference is like sales of next month of seelcted month to purchase  of  selected month as shown in picture for reference















Need help for calculation.
Thanks in Advance 
sandeep

[amitchandak]

MTD diff Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESMTD('Date'[Date Filer])) -Last Year MTD Sales = CALCULATE(SUM(purchase[ Amount]),DATESMTD(dateadd('Date'[Date Filer],-1,MONTH)))