Need help in adding a column in matrix visual made with measures

thanks, The measure are calculating monthly values based on month end dates in the data source and all data sources are connected with date table 1:1. and the matrix has date from date table and measure # from each  month. will be dynamic , so matrix will show past rolling 9 months. 

in my date table last date is 12312400. so i was thinking if any way i can add the condition in my measure  calculation like if date=12312400 then show 0.9 else show measure calculation, then i can use 12242400 month as target in visual.