Current & Previous Month Difference Combine within 13 months period

Hi changhongchoo ,

From this:

Assume my slicer value is now "Jul-21", I want to show the result from "Jul-20" to "Jul-21" only. 

I think you want to display the value of last 13 month not the total difference of the last 13 month,right?

If so , please create a flag measure and apply it to visual-filter pane, set as "=1":

Flag = 
var _sele=MAX('Date(for slicer)'[Date].[Date])
var _datediff=DATEDIFF(MAX('Table'[Date]),_sele,MONTH)
return IF( _datediff>=0 && _datediff<13,1,0)

Best Regards,
Eyelyn Qin
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