You can set the time zone for the system with the timezone keyword. Use the following syntax:
The timezone keyword specifies the time zone value for the system. The directories and files in the /usr/share/lib/zoneinfo directory provide the valid time zone values. The timezone value is the name of the path relative to the /usr/share/lib/zoneinfo directory. You can also specify any valid Olson time zone.
In the following example, the system time zone is set to mountain standard time in the United States.
The installation program configures the system to use the time zone information in /usr/share/lib/zoneinfo/US/Mountain.