Linux Hint published a tutorial about configuring the time zone on Debian 10.

Set Time zone on Debian 10

Usually, the time zone is already set during the installation process when you set up a fresh Debian environment on your system. Using the Debian 10 buster, you can also change the time zone of your system according to your preferences. In this article, different methods to change the time zone of the Debian 10 buster system are explained.

Set Time zone on Debian 10 – Linux Hint