A temporized message system

[eluser]Colin Williams[/eluser]
No need for a cronjob, I don't think. Cron is usually set with crontab (just search 'crontab' in Google). The short of it is, you set some runtime rules and point to a script (could be a codeigniter controller) in a text file on your server, then you point crontab at that file (you have to do this from the command line.)

CI Lee's solution sounds optimal.