There are three types of project dates for each task and milestone: planned dates, late dates, and actual dates.
The planned dates, Earliest Start and Earliest Finish, are the earliest dates on which a task can begin or end given the requirements of the schedule. The late dates, Latest Start and Latest Finish, are the latest dates a task can begin or end without delaying the end of the project.
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You usually enter one or more planned or late dates when planning a project- typically a start date for the project (Earliest Start for the first milestone) or a deadline date for the project (Latest Finish for the last milestone).
MacProject II calculates the rest of the planned and late dates based on the dates you entered, the task and resource durations, and the network of dependencies.