Sawmill's calendar view shows you which years, months, and days have traffic. Clicking on any year, month, week, or day shows you the traffic on that time period--you can then look at that traffic in any way you choose (for instance, you can see which pages were hit, or which search engines were used, or which domains the hits came from, on the day you chose). The calendar view is one of the many ways Sawmill simplified navigating and making sense of the statistics.