Start date
The start date is the date on which you want to start the task. It is used to determine which category the task is assigned to in the default sort order (today, tomorrow, later...). The start date is also the date that is edited in the schedule when using the Organize tool.
Due date
The due date is the date on which the task must be completed.
ℹ️ If both the start and due dates of a task are filled in, the task is displayed over the entire period from the start to the end of the task during a calendar synchronization.