Assignment View Filters:
The default view for assignments can be set to a default in the Assignment Center. Default view options include Assigned, Active or Due.
The default view for the Assignments tab of a course is Active, and this cannot be changed. Filters for this view include Previous, Active, Future, and Range.
Previous: which is anything with a past assigned/due date
Active: anything where today is currently within the assigned/due date
Future: anything with a future assigned date.
Range: allows you to search for assignments that fall within a specific range