In this article we look at how to configure System Timezone and date on a RHEL 6 / CentOS 6 system. A time zone is a designated area of the globe that observes a uniform standard time for legal, commercial and social purposes. The way you’ll change time zone on RHEL 7 is different from how it is done on RHEL 6. This is because RHEL 7 comes with Systemd where administration of the system got many improvements.

On RHEL 6 / CentOS 6 system, Timezones are applied locally by the system through a zone information file located in /usr/share/zoneinfo. The /etc/localtime is a symlink to zoneinfo file.

Configure Timezone on RHEL 6 / CentOS 6

To set correct timezone on a RHEL 6 / CentOS 6 system, edit /etc/sysconfig/clock and change the ZONE= declaration in to ensure the time zone is read properly.

$ sudo vi /etc/sysconfig/clock

Once the file has been modified, run tzdata-update command which will reconfigure your system time zone:

sudo tzdata-update 

This will update file /etc/localtime and notify the operating system that there was a time zone change. No reboot is required when setting timezone.

Configure Date on RHEL 6 / CentOS 6

Let’s install and configure NTP server using Chrony. Install the package by running the command below.

sudo yum -y install chrony

Use NTP servers closest to you.

$ sudo vi /etc/chrony.conf

Start chronyd service.

sudo service chronyd start

Enable service to start at system boot.

sudo chkconfig chronyd on

Verify NTP server is working correctly.

$ sudo chronyc sources
# Also check date and time
$ date

See screenshot from my configurations below.

If using this system as NTP server and would like to enable iptables firewall use the commands below.

sudo iptables -I INPUT 5 -p udp -m state --state NEW -m udp --dport 123 -j ACCEPT

To this end timezone and NTP has been configured on your RHEL 6 / CentOS 6 system. For more informative tutorials check below articles.

Configure SELinux for WordPress Website on CentOS / RHEL

How To Manage Docker Containers & Images in Linux

Monitor Nginx Web Server using NGINX Amplify Agent


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