ОК
To setup corrct timezone you need to copy your timezone file from /usr/share/zoneinfo directory to /etc/localtime file. Just goto directory:
# cd /usr/share/zoneinfo
Use ls -l command to find out your zonefile.
# ls -l
For example I am in Asia/Culcatta (IST time zone) so I need to copy file as follows:
# cp /usr/share/zoneinfo/Asia/Calcutta /etc/localtime