A teacher should be able to give an extension to a student on the due date of an assignment in a relative dates course.

UX required for:

• Batch extensions. This is more for the bigger picture. See below for details of what to implement here.

Acceptance criteria:

• Extensions should not affect the due dates of any other student
• The extension should be visible when viewing all submissions page
• The due date on the edit page should be shown next to the students' names
• The date selector on the edit page should be replaced with a duration selector (days, hours, etc)
• The view all submissions page should show the extension date