Cron Jobs are commands or web scripts that the web server executes at a particular time. There are two different interfaces for Cron Jobs in cPanel, a UNIX-style advanced Cron manager, which is great if you know how to use Cron from a standard UNIX/Linux command line. Otherwise, you may wish to use the Standard Cron manager, which makes it easier to format Cron Jobs. Cron Jobs can execute any fully automated script or even some Linux commands, which makes this a very powerful feature indeed.
Cron Jobs are set to run at a certain time based on the minute, hour, day, month, and weekday given to them.
The order is always: Minute Hour Day Month Weekday Command
The hour is always set in military (24-hour) time and based on the time zone that your server is set to. Next is the day of the month you want something executed on (15 would be the 15th day of the month). Month is the month you want the Cron Job to run in (for example, 1=January and 12=December). Weekday is the day of the week...