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The installer will first attempt to connect to a time server on the Internet (using the NTP protocol) in order to correctly set the system time. If this does not succeed, the installer will assume the time
and date obtained from the system clock when the installation system was booted are correct. It is not possible to manually set the system time during the installation process.
Depending on the location selected earlier in the installation process, you may be shown a list of time zones relevant for that location. If your location has only one time zone and you are doing a default installation, you will not be asked anything and the system will assume that time zone.
In expert mode or when installing at medium priority, you will have the additional option to select “Coordinated Universal Time” (UTC) as time zone.
If for some reason you wish to set a time zone for the installed system that does not match the selected location, there are two options.
1. The simplest option is to just select a different time zone after the installation has been completed and you’ve booted into the new system. The command to do this is:
# dpkg-reconfigure tzdata
2. Alternatively, the time zone can be set at the very start of the installation by passing the parameter time/zone=value when you boot the installation system. The value should of course be a valid time zone, for example Europe/London or UTC.
For automated installations the time zone can be set to any desired value using preseeding.