Group Override for Quiz - Date does not change in calendar or upcoming events, confuses students.

When I set a group override for a closing date for quizzes, the date changes when you view the quiz activity, but in the calendar/upcoming events for the students it doesn't change the date there. So students are confused when it tells them that exams are due when they are not.

Replication steps:

1. Add a group override for a closing date.
2. Date will appear correct when you view the activity, but in the calendar and upcoming event blocks, it still lists the original closing date.

Have not tested user override to see if it does the same. Students haven't reported confusion with that one.