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There usually several ways to do that.
Depending on the system.
I don't know CentOS, so my explanation is somwwhat general.
Cron is a facility every *nix offers in a way.
Each user can have a "crontab" file.
In this file each line defines a job to be run at a certain time one times or repeating.
30 2 * * * /sbin/reboot
The given line tells the crond (the deamon doing all these jobs defined by any user) to run the command "/sbin/reboot"
each 30 Minutes 2. hour on each day month and so on.
As root (as rebooting usually requires to be root) use "crontab -e"
This command gives you an editor to edit the crontab file of root in this case.
Just add this line to that file.
Leave other lines intact if any.
When saving and leaving the editor, you will get a mesage.
Something like " crontab: installing new crontab" if no crontab existed before....