Usually you can view a formula in the Excel cell when cell is selected, but you can protect spreadsheet to hide formulas in some cells.

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.

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.

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

Sometimes it is handy to view (and print) the formulas in all the cells in a spreadsheet with out having to manually enter each cell.

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.

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

If you are working with huge workbooks that contain a very large number of formulas, functions, and data, you can turn off the automatic recalculation.

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