Because time stamps are represented as serial numbers, you can subtract the earlier time from the later time to get the difference.
Goal seeking is a useful feature that works in conjunction with your formulas. If you know what a formula result should be, Excel can tell you which values of one or more input cells you need to produce that result.
If you want to paste text in your worksheet, you can use Excel's Convert Text to Columns Wizard.
This chart resembles a speedometer gauge and displays a value between 0 and 100%.
A common type of date calculation determines the number of days between two dates.
If you have lengthy text in a cell, you can force Excel to display it in multiple lines within the cell.
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. Also Excel 2007 introduced a new ability to create chart templates.
If you're willing and able to edit the Registry on your computer, you can change Excel's number of Undo levels.
This tip describes how to use conditional formatting for comfortable viewing results in the worksheet.
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.