Most Linux/Unix veterans use cron to schedule tasks on their machines and it is a very powerful utility for what it does.
The problem with cron is that it's way to hard and cryptic to use for the newbies / average Linux user. For them, there is an easier alternative to get things done.
Gnome-schedule is a graphical front-end to cron and at, another utility to execute commands at a specified time. It is completely GUI driven and the user does not need to have any prior knowledge of cron or it’s syntax.