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.

To calculate the age, the DATEDIF function, set to check year, determines the number of years between the date in the DOB cell and the current date.

How to Calculate Fluctuations in Excel. Calculating data fluctuations-- also called variance -- is a multi-step process that requires total accuracy. Excel 2010 provides two basic formulas for ...

Fortunately, Excel offers a built-in function, DATEDIF, which makes it easy to calculate elapsed calendar time.

Follow along in this step-by-step guide to learn how to easily calculate hours worked in Microsoft Excel.