The Calendar Toolbar:

Reference Chart:

Term/Icon	Name/Alternate Text	Action It Performs
	View By Year	Displays the current yearly calendar
	View By Month	Displays the current monthly calendar
	View By Week	Displays the current weekly calendar
	View By Day	Displays the current daily calendar
	Back to Inbox	Takes you back to the Inbox
	Logout	Exits Open Webmail

You can also change the year, which will display the dates accordingly. Simply click within the text field where it says "2002", and change it to the desired year. The month, days, weeks, and events will now be changed according to that year.

You can find out more about using the calendar Here.