Here is a cheat sheet on changing the timezone in a linux system (CentOS 6.8 or 7):
# Remove the current timezone file rm /etc/localtime # Create a symbolic link to the new timezone you want # ls -la /usr/share/zoneinfo/ # ls -la /usr/share/zoneinfo/US/ # For GMT ln -s /usr/share/zoneinfo/GMT /etc/localtime # For EST ln -s /usr/share/zoneinfo/EST /etc/localtime # For UTC ln -s /usr/share/zoneinfo/UTC /etc/localtime # For GMT ln -s /usr/share/zoneinfo/GMT /etc/localtime # For New York (Eastern) ln -s /usr/share/zoneinfo/US/Eastern /etc/localtime # For Central ln -s /usr/share/zoneinfo/US/Central /etc/localtime # For Mountain time ln -s /usr/share/zoneinfo/US/Mountain /etc/localtime # For Pacific time ln -s /usr/share/zoneinfo/US/Pacific /etc/localtime # Set Date and Time (as needed) # MMDDHHmmYYYY date 072522172010 hwclock --systohc # If you're using NTPD Service # CentOS 6.
In CentOS 6.8, the init system that brings up all the services (link autoexec files in Windows) was called SysV- Init. This has been the foundation for ages as long I’ve been using CentOS. But in the latest release of CentOS (CentOS 7+) the init engine has been moved to a more favorable engine labeled SystemD. SystemD is the init engine behind Ubuntu, Fedora, Red Hat and CentOS. So the standardization is good for the Linux community but moving from CentOS 6.