1. If you do not set a release date or due date, the assignment will post as soon as you press assign and will appear to students without a due date.
2. Setting a release date means the assignment will not appear to students in Canvas or Google Classroom until that date and time.
3. Setting a due date means the students will see a due date for the assignment, and it will be indicated as past due to you and the student once that date has past within Canvas or Google Classroom, and within the assignment report (although note the assignment will not disappear and will remain available to students).