Working Ninja
Updating CentOS Server Time Zone

Reading log files that are from another time zone can add an additional (and unnecessary) layer to your troubleshooting headache. Most of the servers that I touch are on the Eastern seaboard and thus, depending on the earth’s tilt, the offset can vary (thanks UTC!). To resolve this on CentOS, check out the following two commands:

Make a backup of the current time zone (by moving it):
sudo mv /etc/localtime /etc/localtime.bak

Create a link between desired time zone and /etc/localtime:
sudo ln -s /usr/share/zoneinfo/America/Chicago /etc/localtime

Now run date to verify the changes took.

That’s it!

Source: Change Timezone In Centos