Open response assessments have due dates fixed by the course team. Each step has its own due date which cannot be extended.
On the open response assessment page, the due date of the step you have to complete next is indicated next to In Progress.
For your initial response, it will read, 'Your response is due on...' in your local time zone and M/DD/YYYY format.
If there is a peer grading step, it will read 'Peer grading is due on...' in your local time zone and M/DD/YYYY format.
If there is a self-grading step, it will read 'Self assessment is due on...' in your local time zone and M/DD/YYYY format.
On the Dates tab in your course, the due date will show on the schedule as Weekday, Month Day, Year and the 12-hour datetime. For example, the above would show as due Wed, Nov 6, 2023 6:59pm EST.
The due date is set in UTC by default, but you can ensure it's showing in your local timezone by updating your Site Preferences.