Automatic Zeros
You can choose to automatically assign zeros to missing work past the due date. Students and groups can still submit work after an automatic zero is assigned. Then, you can grade as normal.
After you enable this setting, you don't have to go through your grade centre to manually assign zeros. The automatic zeros setting applies to these graded items:
Assignments and group assignments
Tests and group tests
Graded individual and group discussions
The automatic zeros setting doesn't apply when you collect submissions offline. You manually create the student attempts and submission dates and times.
More on collecting submissions offline
Assign Automatic Zeros
Click Settings icon (⚙) in the Grade Centre to access the Grade Centre Settings panel. 
Click Assign automatic zeros for past due work check box if unchecked. This setting is enabled by default in new courses.
Click Assign Zeros
Any assessment with no submissions after the due date will now say Automatic zero next to the grade.
Late Submissions
Students can submit late to update their grades. You may want to include how late work is graded in item instructions or your syllabus. When a student submits after the due date, the automatic zero is removed. A late label appears with the submission date and time.
Students with due date accommodations aren't affected by this setting. You can add a due date accommodation to revoke an automatic zero. Automatic zeros are assigned to work that's past due when you add a new student or group to your course.
If a member of a group has a due date accommodation, the group inherits that accommodation. No one in the group receives an automatic zero after the due date passes.

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