THIS IS FOR CAMPUS CENTER OR OUTSIDE CENTRAL STANDARD TIME
In order to change timezone, you will need to have the thin client turned on but you don't have to be logged in.
Left click anywhere on the background. This should give you a drop down, select "System Preferences"
From the tabs at the top of the windows, click "Time/Date"
Here you can change the time zone to whatever you wish. Please be sure to use the correct timezone otherwise this will cause issue.