Due date, date ranges and reminders are optional, but very helpful to set goals for yourself and your team members and track progress and deadlines. 

Due dates or date ranges will be displayed on the task card as well as in tasks lists. Tasks with start and/or due dates will also show in calendars.
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Reminders are based on the task due date, which means that you cannot have a reminder without a due date. Reminders trigger a notification to the task assignee at the time and date selected.

Here is how to add, edit and remove the due date, date ranges and reminder on a task: