To do this the formula is similar to the one for when dates are in the future, it is just tweaked a bit to show the difference. You are subtracting the date in the past from today’s date.

This tutorial will show you how to create a Formula to Add, Subtract, Multiply or Divide in Microsoft Excel. You can do basic calculations easily!

How to Minus Years in Excel. Microsoft Excel handles dates as numbers, even though they display as dates -- for example, the date "10/10/2011" is really stored as "40826." This makes it difficult ...