The Commit Activity View displays charts of each contributor's commit activity over the past 6 months. The commit activity charts are ordered from most commits to least commits.
To navigate to the Commit Activity View select Commit Activity from the left sidebar.
You can filter dates by clicking the "Filter Dates" button.
Then, select a start date and an end date. Commit activity data is computed from week to week. This means that the available dates to select will always be the beginning of the week.