To change the timezone from the cli, the following command will be usefull, the command below changes the operating system timezone to Malta.
cp /usr/share/zoneinfo/Europe/Malta /etc/localtime
if you want to change it to a different country
ls /usr/share/zoneinfo/Europe
to see different countries in europe. and change the command the choose your country instead
to see Global
ls /usr/share/zoneinfo/
And select your Continent directory where you can find a larger list of places.