Open the Source Control Explorer in Visual studio (View->Other Windows->Source Control Explorer), and select the top folder for your project. Then right-click and view history.
This will show all check-ins for all code in this folder ordered by date. Then select two dates from the list of check-ins, right click and choose “Compare”. For example if you wanted to see all of the code changed in the past month click the most recent checkin and the checkin from a month ago.
This will show all of the code changed since those two points in time. You can also choose just the past date to compare against your current code. This works in VS2015 which is what I’m using right now. Good Luck.