If a student needs a different due date than the rest of the class.

While creating the assignment you will scroll down to the bottom where there a field box that says Assign

By default it will have only one box with Everyone in the Assign to. 

  1. Click + Add to add an additional Assign to box
  2. Type in the students name that needs the date extension.
  3. Enter the Due Date field and if necessary the Available and Until fields

Once done creating/editing the quiz click Save or Save and Publish