Teaching Commons > Teaching Guides > Technology > Desire2Learn > Tools > Discussions > Setting Dates for Discussions
Discussions have three options for setting date restrictions: availability, locking, and hidden.
Note: Start and End Dates can be added to discussion forums or topics. If date restrictions are added to a forum, they will be applied to all of the topics within that forum.
Note: If a discussion forum or topic is Hidden, it will not appear in the course calendar until the set Start Date.
To learn more about adding threads and posting replies view Participating in Discussions.