Show week numbers in the Date Navigator
  1. On the View menu, point to the Current View, and then click Customize View.
  2. Click the Date Navigator button.
  3. To display week numbers*, select the Show week numbers check box.

Note
  • You should restart the program, to apply the changes.
  • week numbers
    The weeks of the year are assigned a number from 1 to 52, called week numbers. When you turn on week numbers, they appear on the left side of Date Navigator.