Changing timezone in ubuntu/debian

Debian

    echo "US/Pacific" > /etc/timezone
    dpkg-reconfigure --frontend noninteractive tzdata

Ubuntu (assuming you are not root)

    
    echo "US/Pacific" | sudo tee /etc/timezone
    sudo dpkg-reconfigure --frontend noninteractive tzdata

NOTE: there is no need to reboot the system for the new settings to apply

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