Amazon EC2 time zone
I don't run Fedora for my EC2 instances as I need something stable for more than 6 months, so I use CentOS... But it should be the same... Just run the following:
ln -sf /usr/share/zoneinfo/America/Los_Angeles /etc/localtime
That should change your systems default timezone to PST and should only be affected when the instance is brought up from scratch.
Change the ZONE setting in /etc/sysconfig/clock