date filtering

I am creating a workout log application. http://www.zohocreator.com/jgianoli/fitness-v1-public/

I want to filter based on dates. For example, how do I filter for just the past 7 days. The idea being, I want to see a list of my workouts the past 7 days and see totals for minuts on the treadmill, miles on the treadmill in the past 7 days. Any idea on how to do this? Currently I can only filter on the month.