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

When you want to know the number of days between two dates whether the date is in the future or the past, you can use Excel to calculate it. You can easily use Excel formulas to tell you the ...

As a result, using the WEEKDAY function to calculate days of the week for dates in 1900 before March 1 yields incorrect results in Microsoft Excel worksheets built using the 1900 date system.

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

If Microsoft Excel does not recognize dates, then there is something wrong with the formatting. Use any of the methods mentioned here to format cells perfectly.