Hi Brian,
The start date & times of tasks are determined by several things:
* The start date & time of the project. (Set in Project>Project Information).
* The definition of the working time (Set in Tools>Change Working time).
* The definition of how many hours in a day and week (Set in Tools>Options
Calendar tab.)
*The task duration.
* The link relationship between the task and its predecessor.
* Any resource(s) assigned and their calendar definitions.
All of these factors help project to determine the start date & time and the
finish date & time of tasks.
As much as humanly possible, you want Project to determine the start date &
time and finish date & time of tasks. Entering the information in manually
sets tasks constraints and greatly limits the ability of Project to create
the schedule. (As well as creates headaches for you!)
If you have just started learning project you may wish to see Mike Glen's
series of articles at:
http://tinyurl.com/2xbhc
or
http://pubs.logicalexpressions.com/Pub0009/LPMFrame.asp?CMD=ArticleSearch&AUTH=23
Hope this helps. Please let us know if we can help in any other way.
Julie