Ubuntu 15’s default time zone settings are currently set to GMT (Greenwich Mean Time), UTC (Greene’s Time) and CEST (Central European Summer Time).
As a result, your local time zone will be UTC, UTC+02:00 and UTC+03:00.
In order to change this to GMT+02, UTC, and CET, you can use the GST command: gst zone set GMT+2,UTC+02 You can also change the time zone with the -t option, where time is an integer, such as 3:00pm,3:00am or 3:30pm.
As a quick reminder, GMT+08:00 is GMT, GMT +08:01 is GMT+09:00, GMT-08 is GMT-09:01 and GMT+12:00+01 is UTC+12.
So, in this case, the command: /etc/init.d/gst set GMT-02,UTC-02 would change your local clock to UTC+08 and your GMT clock to GMT-12:12.
Here is a quick example.
/etc /init.da /bin/gsts set GMT2,GST12,UTC2 /etc