Testing steps: As Admin create a new Course Create a new Assignment with: Allow submissions from date set to a particular date (e.g. today's date) Due date set to a day before or equal to the Allow submissions from date Cut-off date set to a day before or equal to the Due date Remind me to grade by date to a day before or equal to the Cut-off date Save the Assignment You should see the following error messages: Due date cannot be earlier than the allow submissions from date. Cut-off date cannot be earlier than the allow submissions from date. Remind me to grade by date cannot be earlier than the due date. Update the Due date  to a date equal to or after the Allow submissions from date , the existing ' Due date cannot be earlier than the allow submissions from date. ' error message should not be shown. Update the Cut-off date to a date  to a date equal to or after the Due date , the existing ' Cut-off date cannot be earlier than the allow submissions from date. ' error message should not be shown. Update the  Remind me to grade by date to a date equal to or after the Due date , the existing ' Remind me to grade by date cannot be earlier than the due date. ' error message should not be shown. Repeat testing from Step 2. but only update the  Cut-off date  to a date before the  Due date , but both dates are greater than the  Allow submissions from date . You should see the following error message: Cut-off date cannot be earlier than the due date.