Apple tvs not working

I have 2 Apple Tv's not working it says they can't connect to iTunes, when I try to turn on home sharing it says wrong email or password. I can sign into I cloud it also says something like the server time needs to be connected. I have spent the last 4 hours unplugging everything over and over restarting and I've even reset . I have a air port extreme would that prevent the Apple tv from not working? I tried to sign in to my Mac figure out if I need to update the AirPort Extreme but I have no idea what im doing or what anything means ! Please HELP !!!!! my Apple TV was working earlier today I just bought new tvs and another Apple TV nothing wants to work! I've called apple support and they couldn't help me!!