For example, we want to be able to have a specific List Notice appear every Saturday between midnight and 4PM EST.
Use: Weekly events are a great way to distinguish a site from larger competitors like Facebook or Reddit. We have a weekly chat room on our forum, every Saturday from 3-4. Every week we have to update the built in list notice because there is no way to do this. After a couple of months, it gets pretty old.
Here is a screen shot of the current Date Criteria tab for the list notice system in the Admin CP: