If you want to change the timezone in Ubuntu, there is an easy text-based menu-driven way to do so.
- From the CLI type:
sudo dpkg-reconfigure tzdata
- After you select the time zone, you should see something like this:
Current default timezone: ‘America/Los_Angeles’
Local time is now: Thu Dec 8 09:39:56 PST 2011.
Universal Time is now: Thu Dec 8 17:39:56 UTC 2011.