Tip #2 : Scheduling tasks with WordPress
Posted by Leonid Mamchenkov on August 15, 2007
Since WordPress 2.1 there is a way to schedule tasks from within WordPress (as opposite to using external schedulers). It is quite useful for doing systematic backups, cleaning user databases, importing data from other resources into your database, and things like that.
Glenn Slaven wrote a nice article – “Timing is everything: scheduling in WordPress” – explaining how to use this feature. If you read it through, tried, and failed to make it work, there is a Cron Demo plugin, which should get you started.