On the course homepage, you can find the end date under Important Dates labelled Course ends.
The Dates tab will list all assignment due dates and the end date.
In a self-paced course, all due dates except the final end date and open response assessments are flexible up until the end date. Read more about how self-paced courses and the suggested schedule works.
In instructor-paced courses, all due dates are fixed and can't be extended. If an assignment hasn't been released yet, the Dates page indicates this with 'Not yet released.' The Dates page also lists the date certificates will be awarded (Certificates Available) to learners who earned a passing score, after the course end date.