To make your discussion available on a specific date or during a specific date range, enter the dates in the Available From and Until fields, or click the calendar icons to select dates.
You are not required to enter dates in both of these fields, so if you want to delay your posting but do want your post to appear indefinitely, you can leave the Until field blank.
Note: These fields only apply for non-graded discussions; If you create a graded discussion, these date fields do not apply.