Limiting access to certain times

Dear marc_milanich,

     Though you posted this 5 months ago I do feel that this can be a re-asked question that at the time I'm replying, you sadly cannot do a time lock on assignments.

      However, if you know that the student(s) have not started the assignment you can delete it form their assignment list, I will tell you how you can do that, but keep in mind that they can still go to the topic their learning and do the assignment whilst not having it assigned. If you chose to do this there's a work around. If a student does an assignment(s) before you assigned it or after removing it form their assignment list. It will show that they done it own their page however the assignment wont be marked as done so you may have students coming to you saying they did it but it's not saying they did but there is a score, then that is because they did it when it wasn't assigned. 

Now, in order to delete assignments from a student('s) assignment list you have to: 

1. Go to your teacher dashboard.
2. Choose your desired class.
3. In the left-hand sidebar, go to the Manage page under Assignments.
4. Select the assignment(s) you want to delete by clicking the checkbox.
5. Click on delete.

Cheers,

-Andrew