Ubuntu provides a tool that makes changing the timezone from the command prompt/console very easy. Just follow these steps.

Change the Timezone of an Ubuntu Machine from the Console

  1. Execute this from the console as root:

    dpkg-reconfigure tzdata

  2. You will be presented with this screen:

  3. Use the up/down arrow keys to select your Geographic Area. I am in US so I will select that (I could also select America and the next screen will display cities).

  4. Select your timezone, city, state or region and press enter

Your time will change and be displayed on the command prompt when you return.