Excel automatically recognizes common formats, such as "3/17/2012," "Mar 17, 2012" or "17 Mar 2012." Use the Month function to extract the month number from a referenced cell.

This month’s column shows how to use the remarkably versatile AGGREGATE function in Excel.

How many days? Excel doesn’t offer a function that returns the total number of days in a specified month, and before EOMONTH () came around, an expression to do so was complex.

Formulas are powerful tools for performing calculations and analyzing data in Excel. In this beginner’s guide, you’ll learn how to use formulas and explore some popular built-in functions.

How to use a DAYS function in Excel In this tutorial, we will find the number of days between the dates in the month. Click the cell where you want to see the result, then type =DAYS (A3, B3).

Unfortunately, if you're using Excel 2019 or earlier, you won't be able to create your own functions using the methods described in this guide.