Enter Requested start and Requested end in the respective fields or define the Remaining duration value.
- Click on the calculation button
in the toolbar. In doing so, calculated dates of the task (Calc. start and Calc. end) are calculated automatically. - If no requested dates are defined for tasks, but the durations, the requested start date of the project is used as the start date for the calculation and, if no requested dates are defined for the project either, the tasks are scheduled from today's date.