You can use the Canvas “Quizzes” feature to create and administer exams. Canvas "Quizzes" offers many question types and other features, including... Read more about Setting Up Your Exams in Canvas
For students with officially approved extension of time accommodations, set up their timed exam with extra time using the Canvas "Moderating This Quiz".
For students with an officially approved extension of time accommodations, you can append the due date and available to and until dates in Canvas Quizzes and Assignments.