timezone — Local time zone configuration file
/etc/timezone
The /etc/timezone file
                configures the system-wide time zone of the local
                system that is used by applications for presentation
                to the user. It should contain a single
                newline-terminated line consisting of a time zone
                identifier such as
                Europe/Berlin. The file
                /etc/localtime corresponds with
                /etc/timezone and contains the
                binary time zone data for the time zone. These files
                should always be changed simultaneously and kept in
                sync.
The time zone may be overridden for individual programs by using the TZ environment variable. See environ(7).