Instructors can use the Override function in Moodle assignments to create differentiated assignment due dates for individuals or groups.
Visit the assignment page.
From the Assignment administration menu, choose either Individual overrides or Group overrides
Click Add override
Choose a group or individual student and set your overridden due dates as desired. When finished click Save to exit, or Save and enter another override to add another override.
Any overridden allow submissions from, due, or cut-off dates are reflected on the assignment View all submission page.