The Excel ISBLANK function returns TRUE if cell value is blank and False if the cell is not blank, and it is also an information function.

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.

Bookkeepers, project managers, HR departments and more use the Excel Date & Time functions WEEKNUM, ISOWEEKNUM, WORKDAY, WORKDAY.INTL to calculate time. Here's how.

Learn how to highlight dates before today and a specific date with and without using the Today() function in Microsoft Excel.

Excel's data validation feature is more versatile than you might think. Learn how to use literal values, input values, list values, and even formulas to restrict input date values using data ...

How to Use the IF Function in Excel to See Who Has Paid. Excel's IF function validates a cell's contents, determining whether it meets criteria that you set. It provides no information beyond what ...

DATEDIF(), which means Date + Dif, is a compatibility function left over from Lotus 1-2-3 that Microsoft adopted in Excel version 2000. It's fallen off current Excel menus, but you can still use ...