How is the Time Selection filter supposed to work here? Are you trying to have the entire view change to the level of detail of that time selection? If so, the easiest route to go is to create a view for each time selection and then use a Sheet Selection on Steroids type solution to swap between the views at each level.
Also - the view really doesn't appear to be for "May" here so much as it appears to be a 3, 6 or 12 month avg looking backwards on the current view from each month. I don't see the use of the date selection in play. Was there something you wanted for that to limit the view on?