You can add dates to your list at three different levels:
The boxes below explain how each level's dates work.
The dates set for your list will are summarized at the top, just under the list name, along with other status information. When you hover your mouse over it, the text "List visible only during these dates" pops up.
Adding dates for sections is completely optional.
If you add dates, students (and you) will see the dates for the section, even outside of the dates.
You can choose to click "Section visible only during these dates" if you want to hide the entire section outside of these dates.
At the citation (item) level, you can set a "Due Date".
Screenshot of student view for "Upcoming Due Dates":