For Topical Homework, you can choose the start and end dates for all assignments via your teacher account.
When assigning homework, click on the Start/End section and choose the assignment period* on the calendar.
* Note that students can still attempt the homework and make submissions even after the end date. You may check each assignment's leaderboard to determine whether the submission has been made prior to the end date set.
For Custom Homework,you can choose the start date and manage the deadline for the assignment flexibly.
When assigning homework, click on theEdit link under Advanced Options (Refer to screenshot above).
Click the Calendar icon to specify Start Date and the Submission Deadline**.
Check the 'Close after deadline'box if you do not want students to attempt nor make a submission after the specified deadline.
**Students can still attempt and submit after the deadline if you did not check the 'Close after deadline' box.You may check each assignment's leaderboard to determine if the submission was made before the deadline.