If you have stored a lot of activities in your calendar then you may be required to navigate through months and years for finding desired date/task. To do so, follow these easy steps:
Step 1: Select 'Calendar' tab

On ribbon, click the "Calendar" tab.
Step 2: Navigate through Months

At the top of left pane, a mini calendar representing 3 months, is shown. It represents current month followed by next two months.

In this screen-shot, a more closer view of that calendar is shown. By clicking on arrows shown at both corners, you can move between months to find desired date of any month.
Step 3: Navigate through Years

To quickly select any month of current year or any other year, simply click on month label and hold down the left mouse button (without leaving it).
To view future months/years, hold down left mouse button and move it downward.
To view past months/years, hold down left mouse button and move it upward.