


Substitute the cell reference of your top-most date cell for cell B4. In cell C4, we entered the formula =TODAY()-B4. The open dates are all in the past, so we can use a simple subtraction using the TODAY function of Excel.

In the example below, our help desk calculates how many days trouble incidents have been open. How many days has an invoice been open? There are many examples of wanting to know the number of days between today's date and a date in the past. Formula When Worksheet Dates Are in the Past If you need to perform these calculations in your sheet and you know some of the worksheet dates might be missing, we recommend reading How to Subtract Dates From Today's Date When Some Dates are Blank instead.
