Our teachers want the quiz questions, answers, points and feedback to be hidden to students when they use Manual Posting. They reveal all after grading is complete and posted. We'd like to see quiz settings make that automatic by date; right now it involves manual quiz settings editing because the Hide Results by dates don't cover everything we want hidden.
When students view the submission, or submission details through the gradebook, if results are hidden by show-on date students still see feedback in addition to questions and answers. Also if you don't hide points awarded, then students know which questions they got right because it has points.
Since there are no dates for Feedback, Points Possible or Points awarded, if you don't hide them they are available at all times. If you temporarily hide them it's necessary to edit the settings to unhide them.
It seems like it would be easier to not bother to enter the dates, just have all results hidden and then manually turn that off when grading is done. It's more work to enter dates. There's no way to prohibit students from seeing all quiz details without having to edit quiz settings to unhide after posting grades, whatever you do.