One of the many features of Excel is being nosy. That's right, you can quickly calculate a persons age as long as you have their birth date.

We show you how to use Excel to count days between two dates using the DAYS, DATEDIF, NETWORKDAYS, and TODAY functions, and Subtraction.

The EOMONTH function in Microsoft Excel returns the last day of a month in the past, the current month, or a month in the ...