Hello Vishal,
I am assuming that you have used Year Month Dimension(Say [ActualDateDimension]) in your Graph and having format YYYY-MM
So create a Dimension as
[CurrentYearMonth]=FormatNumber(Year(CurrentDate());"####")+"-"+FormatNumber(MonthNumberOfYear(CurrentDate());"0#")
Then Create aother Dimension as [Check]=If [ActualDateDimension]=[CurrentYearMonth] Then 0 Else 1
And use this Check in your Graph filter as [Check]=1
Hope this helps.
Regards
Niraj