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

This post will show you how to calculate the percentage difference between two numbers in Excel. using this formula you can find percentage difference easily.

Since each date is really just a number stored in Excel, to compute the midpoint of two dates you would use the same mathematical formulas you would use to calculate the midpoint of two numbers ...

The starting point is the price information for each date on which you're producing an average. First, calculate the difference between the two prices for each date.