When calculating the difference between two dates, you may want to exclude weekends and holidays.

A common type of date calculation determines the number of days between two dates.

Creation of a large number of visually consistent charts to represent different data is a time consuming and error prone task, unless you know how to copy formatting between charts.

If you need to select all objects embedded into the worksheet, e.g. select all charts to adjust their size, press Ctrl+G and click the Special button or use Ctrl to select objects individually.

Sometimes, you may want to view two different parts of a worksheet simultaneously - perhaps to make it easier to reference a distant cell in a formula. Or you may want to examine more than one sheet in the same workbook simultaneously.

The easiest way to enter a function into a formula is to use the Excel program's Insert Function dialog box.

Excel offers you an ability to assign user-level permissions to different areas on a protected spreadsheet. You can specify which users can edit a particular range while the spreadsheet is protected. As an option, you can require a password to make changes.

The Excel TEXT function enables you to specify numbers and date format.

With Excel built-in tools you can easily work together on workbooks and monitor who, when and what changes made. E.g., track project status and tasks.

Much like as you can protect elements of each Excel spreadsheet (see Protecting spreadsheet elements for more details), you can protect structure of the sheets in the workbook, prohibiting renaming, moving and other operations.