How to Make a Cell on Microsoft Excel With a Changing Date. Microsoft Excel offers a Function Library with formulas that insert the current date when you open the worksheet or enter calculations.

How to insert & use Functions in Excel Functions help you perform a variety of mathematical operations, lookup values, calculate date and time, and a lot more.

Excel has over 475 formulas in its Functions Library, but we've selected the most popular, from date and time functions to mathematics and simple data manipulation.

Microsoft Excel's new dynamic array functions make complex calculations easier than ever before.

Excel’s Date & Time functions ease the workload for bookkeepers, project planners, HR departments, and other jobs where time is money. The four functions covered here—ISOWEEKNUM, WEEKNUM ...

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