Troy, Try a web part connection (no Sharepoint Designer needed.) Add another view of the same list to your page, modify the title of the web part to "filter by period ending date" It sounds like you have multiple records returning for each day, so group them according to your PERIOD ENDING date, and only show that date in the view. Then limit those groups to 2 or 3, it is a setting just below the grouping option. Keep the groups collapsed. If you are following me, you'll realize you'll have 2-3 days of grouped dates on your screen in one web part, below it you have your library with all your docs. Sort both lists by most recent. Now, in edit page mode, under the Modify Shared web part, is the option of Connections. From this newly created grouped dates list use a web part connection to 'provide row to' your document library to use the PERIOD ENDING dates from the grouped list as a filter for the main doc library (make sure PERIOD ENDING is displayed in both views.) Once the connection is made, you can expand the group and click the date underneath, that will act as a filter to your document library below.
I just submitted an article on this topic late last night, if you can't follow my suggestions here, the pictures in the article might help. You can probably find it on EUSP in the next 7-10 days.