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Set timezone at command line in Debian Live

To list timezones:

timedatectl list-timezones

To set the timezone to Europe/Dublin:

sudo timedatectl set-timezone Europe/Dublin

To set the timezone to Europe/Athens:

sudo timedatectl set-timezone Europe/Athens

To set the timezone to Atlantic/Azores (UTC -01:00)

sudo timedatectl set-timezone Atlantic/Azores