Time Intelligence - Create a Variable to return Previous Month for Custom Calender

[Anonymous]

Hello, I have a custom Calender where May is termed as BinderMonth1 and April is the 12th Month of the Binder Year. I need to create a variable to return previous month. But If the Month in Context is May then it should return April of Last year as Previous Month. How can i do that? The code in work is:

VAR PreviousPolicyMonth =

IF(

HASONEVALUE(DimDate[BinderMonthNumber]),

IF(CurrentPolicyMonth =1,TOTALMTD(PREVIOUSMONTH(DimDate[BinderMonthNumber]),ALL(DimDate), DimDate[BinderMonthNumber] = MaxMonthNumber && DimDate[Binder Year] = CurrentYear -1), VALUES(DimDate[BinderMonthNumber])-1)

,BLANK()

)

I am struggling with the third line on this code where i need to add previous month dynamic for May to return April of last year as mentioned above. Kindly help. Thank you. @amitchandak @Anonymous @harshnathani 

[amitchandak]

@Anonymous , You can use Rank for that. As long as you have a start date, you can create rank on that and use that to find this period vs last period

refer to the week example. same is true for any custom period

https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3
https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-Last-Week/ba-p/1051123