Because time stamps are represented as serial numbers, you can subtract the earlier time from the later time to get the difference.
Solver tool allows you to specify multiple adjustable cells and constraints on the values that the adjustable cells can have, generate a solution that maximizes or minimizes a particular worksheet cell, generate multiple solutions to a problem.
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.
Excel's ability to create automatic subtotals is a handy feature that can save you a great deal of time.
This tip describes how to add watermark text or picture to your workbook.
Sometimes you need to manage lists where the information is arranged in rows. Excel offers a simple way to work with this big data in rows.
Often you'll want to insert a series of dates into a worksheet. The most efficient way to enter a series of dates doesn't require any formulas - just use Excel's AutoFill feature.
If you want to paste text in your worksheet, you can use Excel's Convert Text to Columns Wizard.
This tip describes how to use conditional formatting for comfortable viewing results in the worksheet.
When calculating the difference between two dates, you may want to exclude weekends and holidays.