I have a series of reports. The first two reports are sliced by a Week Ending filter to display only data that corresponds to that week. On the third report, I want it to sum data YTD through the week ending date selected. I think I need to pass the date selected in the filter to a measure, and then calculate the data based on <= the selected date. My issue is that they may select more than one date in the filter. What is a measure to capture the max date selected?