You may want a specific item in your playlist within a specific date range, while you may prefer other items to play all the time. You can do this by the Campaign Dates tab in Display Rules.
How do I add campaign dates for an item?
If you do not have a playlist, visit Creating a Playlist.
Go to Contents.
Click on the playlist that you want to edit.
Click on Edit Display Rules button on the item that you would like to set campaign dates.
On Campaign Dates tab, select start and end dates and times.
When you finish, Request Approval, Approve and make your content Go Live.
Next: 7.3 Day Control
Previous: 7.1 Introduction to Display Rules