Since Best Online Traffic School reports your completion information to the DMV electronically and instantly at no extra charge, you may enroll in the course on your due date.
Keep in mind that you have until 11:59 PM (PST) on your due date to complete your course, otherwise your completion will be late.
Since your certificate of completion includes the completion date, you will still be in compliance with the court's due date.
However, we are not responsible for submissions past the due date. You will have to contact the court if you've missed your due date or would like an extension.