Excel offers several easy ways to calculate expiry dates. This post explores different ways to automate expiry date calculations in Excel.

Calculate percentage difference between two numbers in Excel Percentage change or percentage difference can be applied to any quantity that you measure over time.

To ensure that Excel converts your date to a number enter it like this, without quotes: "4/4/2011". Then click on cell "A2" and enter the later of the two dates in the same manner.

A TechRepublic member wrote for advice on calculating the years, months, and days elapsed between two dates. This tutorial explains the solution provided by TechRepublic contributor Jeff Davis.