Don't, It's against the Terms & Conditions.
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You have comands in minecraft to cheat and they are legal.
Simply be far as decided to use even go want to do look more like, and then you have hack minecraft.
You can't unless you get a mod, you hack or you get a texture pack
Well that is quite illegal, first you have to hack the admin's computer, then hack into C; drive. then find the minecraft server file which says admin, then write your name and get out of there. Or just ask the admin to admin you
You need to have the hack where you have singleplayer commands. Then you do /time day :)