Most people who have this question want to know how much it might cost them to run a propane powered generator at their home. This is a very good question because there are some significant advantages to using these devices but there are also some disadvantages that you should probably know about.
This date is based on the task's start date, as well as on the late start and late finish dates of predecessor and successor tasks, and other constraints. How Calculated When you first create a task, its late start date is the same as the project finish date minus the task duration.
For Example if you were to write a date function as =DATE(2009,4,35) it would give you a date 35 days ahead of 1-Apr-2009. The result in this case would be May 5, 2009. Similarly you could use a negative number generate a date in the past. (You can even enter fractions though that would not be much use.).