What is localtime in Ubuntu and how to customize it

In Ubuntu and other Linux systems, localtime is a time zone setting that is used to display the local time on your computer.

How the setting is made

If your system is configured to work with localtime, the time on your computer will be displayed according to the local time zone to which you have configured the system. For example, if you are in Moscow, the system will display the time in the Moscow time zone.

In Linux, the setting for localtime is the default setting. However, if you need to change the time settings to use localtime, you can do the following:

1. Open the /etc/timezone configuration file in a text editor:

sudo nano /etc/timezone

2. Change the contents of the file to the name of your time zone, for example, "Europe/Moscow".

3. Save the changes and close the file.

4. Reset the current time setting:

sudo dpkg-reconfigure --frontend noninteractive tzdata

5. Reboot the system:

sudo reboot

After rebooting the system, the time will be displayed according to your local time zone (localtime). Note that with this setting, if you are running multiple operating systems, there may be a problem with time synchronization, so it is recommended to use UTC instead of localtime if possible.