Assignment Settings - Access Control
1. Open the Assignment Editor by going to Assignments, My Assignments on the navigation bar to the left, then clicking on the pencil to the far right of the assignment name.
2. When in the Assignment Editor, click on the Settings Gear at the top right and select Open all Settings from the dropdown.
3. Click on the Access Control tab on the left of the pop-up window and checkbox the Limit Student Access to Single Date/Time Window option. With this setting, you can limit student access to an assignment to a specified date and time. Click Save Changes.