I am using OS X 10.9 .5 , and here is what I want to do. When you click "Open Date & Time Preference", you will find an option that states "Set date and time automatically". And of course you can chose not to do that, and adjust the time. But can you remove that option? So your OS X is forced to chose the mode "Set date and time automatically" no matter what you do? (aka you can't adjust the time by yourself now.) Is that possible? Is there an app that can achieve this goal or can you do that at Terminal? Thanks in advance.