Ubuntu change timezone from command line

To change timezone from command line therefore updating your date & time to a new/correct timezone, follow these steps.

Step 1: Check current datetime & current timezone

Check current datetime

date

#output
Fri May 24 18:45:26 +07 2019

Check current timezone

cat /etc/timezone

#output
Asia/Bangkok

Step 2: Update timezone to a new one

Using this command to do

sudo dpkg-reconfigure tzdata

A configure screen will display to let you choose your desire timezone

Update timezone to a new one

After selecting new timezone done, your datetime will be updated automatically.