I can't change the date and time settings on my Mac

To see if the MacBook still has managed preferences left on from St Cuthbert's College, complete the following: 

Start by removing the "Enable Parental controls" checkbox from Users and Groups for the user if enabled, then run the following commands in terminal: 

1. Open Terminal 
2. Run the command 
mcxquery -user {username} 
to see if there are any managed preferences in place 
3. If there are management preferences, run these commands; 
4. sudo su (and enter password of the account you are logged in as) 
5. dscl . -mcxdelete /Computers/localhost 
6. dcsl . -mcxdelete /Users/{username} 
7. mcxquery -user {username} 
8. Check if the software update can be run 
9. logout and then log back in again - check that the software update still works 

where {username} is shown above, this should be replaced with the student’s login value. You can find out the login value by typing whoami into terminal. 

sudo jamf removeFramework 

This will then ask you to put in your password, which is the logon password for the account you're logged in as. The password will not show as you are typing, so you will need to enter the whole password then press return. 

If this then runs through a process onscreen, starting with "removing scheduled tasks" etc, then run the following commands in terminal after the commands finish: 

Sudo jamf removeFramework 
security authorizationdb write system.preferences allow 
security authorizationdb write system.preferences.datetime allow 
security authorizationdb write system.preferences.networktime allow 
security authorizationdb write system.preferences.network allow 
security authorizationdb write system.services.systemconfiguration.network allow 

This will ask for your password between each step - this is your login password. 

Finally, open Finder, choose "Go" from the top of the screen, and choose "Go to folder" 

type in /library/ and click "Go" 

Control and click on the "Managed Preferences" Folder if this exists. Choose "Move to Trash", then restart the computer and log back on.