Filtering data between two columns from different tables

I have two tables with a ONE to MANY relationship via POLICY NUMBER.  On the ONE table I have a column POLICY EFFECTIVE DATES and on the MANY table I have multiple drivers identified on a DELETEDATE.  I want to filter to count only the number of drivers where the difference betwen POLICY EFFECTIVE DATES and DELETEDATE are less than 365.  The reason being that when a policy expires after one year (365) they are all marked with a DELETEDATE 365 days after the POLICY EFFECTIVE DATE.  I only want to cound the number of drivers which are deleted before the policy expires at 365. 

Here is a sample of the table relationships.  I have tried filtering the data based on the relationships, but I do not know if Power BI can subtract the DELETEDATE from the POLICY EFFECTIVE DATE as a condition prior to filter and summing the remaining driver.  Is this something better accomplished as a query on Access DB and then loading the data in Power BI or is there a formula in Power BI to compare the dates on these two columns and then summing the drivers which qualify (meaning having a DELETEDATE less than 365 days from the POLICY EFFECTIVE DATE)?