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

Excel DATEVALUE is a Date and time function, and its purpose is to converts a date in the form of text to a serial number. Learn how to use it.

The NETWORKDAYS function in Microsoft Excel is a date and time function that returns the number of whole working days between Start_date and End_date. The NETWORKDAYS function excludes weekends ...

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.

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 it.

When you enter a date string, Excel formats it as a date using the date format, d-mmm-yy. Figure A The date is an integer; time is a decimal value. A day equals 24 hours.

I’m using Microsoft 365 on a Windows 10 64-bit system. This newish function is available in Microsoft 365 and Excel 2021, and Excel for the web.