You can set an end date on a quiz in the Add Extras page while you’re assigning it. Or, if you’ve already assigned the quiz, you can click on the date the change it.
Once the end date has passed on a quiz, the quiz will continue to show up on students’ pages. The difference is that on your results grid, the words "LATE!" will now show up next to any student’s name who completed the quiz after midnight on this date, or if they haven't completed the quiz by then. Here’s what this looks like:
Hover over a late student's name to see when they completed the quiz. This information will be included when you download the quiz results.