Once you have all key diary events and targeted activity in place, you can generate a Release Planner Document from your Campaign Diary.
Open your Campaign and click on the Diary Dashboard in the left-hand menu
Click on 'Reports' and then on 'Create Release Planner'
Make sure the Release Planner Template is selected (showing a green icon with white tick)
Click Generate Report
The weeks prior to impact will be displayed as T- and the weeks after release T+.