I just usually use HKT because it is the easiest and it is the same as PHT. (Philippines Time)
1. Open a SSH/Terminal and type the following commands, and for windows user you can used putty to connect to server or you can access the Terminal by logging into VNC and right-clicking on the background, then select ‘Terminal’.
ln -sf /usr/share/zoneinfo/Hongkong /etc/localtime
Type in terminal to check your current time that has been setup.
date
Output on my linux CentOS VPS:
[root@localhost ~]# ln -sf /usr/share/zoneinfo/Hongkong /etc/localtime
[root@localhost ~]# date
Fri Dec 26 10:33:32 PHT 2014
[root@localhost ~]#
Note:
The first two letters is LN in lower-case.