The reverseCalculateTargetDates plug-in allows you to reverse calculate the dates. It is designed to let you know when you must start development, based on the finish or delivery date.

The plug-in sets the target dates for product tasks by reverse calculating from the last task. The plug-in logic determines the last task based on the critical path. It sets the target date as the final target date value for the product calendar. The final target date is an attribute that is on the calendar; it is not on the individual tasks. The logic then calculates the remaining target dates by calculating backwards using the durations entered for each task.