I have a server set up through Amazon AWS. It's Amazon's RHEL-based AMI. When I initially booted up the machine, I set the proper timezone by creating a symlink:
ln -sf /usr/share/zoneinfo/America/Los_Angeles /etc/localtime
This works just fine, but whenever Amazon provides an update to their AMI the timezone automatically reverts to UTC. Is there a way around this or does it have to be manually set after each update?