Rolling 12 months against another rolling 12 months from a previous period

[Anonymous]

Hi all - I'd like to do some DAX to get a rolling 12 month figure, then compare that to a rolling 12 month from 2 years ago, but I'm having trouble figuring out how to do it

I have a calendar table with things like 'DATE', 'YEAR', 'MONTH', 'WEEK IN YEAR NUMBER' etc and I'd like to be able to do it for the latest full completed week, so looking back from week 45 in 2021 to week 46 in 2020 and then have the same thing for from week 45 in 2019 to week 46 in 2018 and then a sum that compares the change between the 2 results

I'm guessing I might need some kind of variables? If anyone has any suggestions I'd be very grateful 🙂

For info I have a DAX measure for Product Net Sales already to get the data for 'equal to or less than week 45 from 2021', looks like this:

2021 ROLLING 12 MONTH PNS = CALCULATE(

SUM('Invoice_Transactions'[Product Net Sales]),

FILTER('Calendar','Calendar'[WEEK IN YEAR NUMBER] <= 45))

[v-yanjiang-msft · Accepted solution]

Hi @Anonymous ,

According to your description, here’s my solution.

Best Regards,
Community Support Team _ kalyj

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[amitchandak]

@Anonymous , You need to try measure like

Rolling 12 = CALCULATE(sum(Sales[Sales Amount]),DATESINPERIOD('Date'[Date ],MAX('Date'[Date ]),-12,MONTH))

Rolling 12 before 12 = CALCULATE(sum(Sales[Sales Amount]),DATESINPERIOD('Date'[Date ],MAXX('Date',dateadd('Date'[Date],-12,month)),-12,MONTH))

For week level with rank you can get similar results

Power BI — Week on Week and WTD
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
https://www.youtube.com/watch?v=pnAesWxYgJ8