Managing Scheduled Tasks 
When going to Scheduled Tasks > Scheduled Task Manager, you will be presented with a screen like this:

The columns mean the following:
Colin 20th Apr 2005, 11:11am
The month can not be edited and is only shown in this screen to look more like the unix cron system.

See this bug for details: http://www.vbulletin.com/forum/bugs.php?do=view&bugid=2571