Please tell me where I can change the Time Zone of the Cpanel 11 from? I could not find it anywhere.
For VPS there should be "Server Time" within "Server Configuration".
If you're using Cpanel on some shared hosting service then I'd expect that to be a server wide setting, which cannot be changed by you. (One could temporarily set it for specific requests, like in PHP code, but only temporarily for that specific request then.)