There are couple of ways by which you can change time zone in your Linux box. One of my server was running EDT time zone actually i need to set it to IST. Â The easiest way to change timezone by typing the following commnad
mv /etc/localtime /etc/localtime.old && ln -s /usr/share/zoneinfo/Calcutta /etc/localtime
The above example i have deleted my localtime file and made a link to calcutta zone.