To calculate the number of days between two dates

  1. Click Tools, then click Date Difference.

  2. In the Start Date group box, click the arrow buttons to move forward or backward one month or year at a time, then click a date.

  3. In the End Date group box, click the arrow buttons to move forward or backward one month or year at a time, then click a date.

  4. View the calculated result in the Number of Days Different text box.