If you are working on terminal in Linux Mint / Ubuntu and need to configure your time zone without using the GUI, follow the following steps:
1. Issue the following command at the terminal -
sudo dpkg-reconfigure tzdata
2. Now select your geographic area and then select ‘<Ok>’ to proceed.
3. Finally, select the city that corresponds to your time zone and then select ‘<Ok>’ to proceed.
4. All done! You have successfully configured your time zone.