Ubuntu 18.04 show date and time on every screen

Install GNOME Tweak Tool:

sudo apt install gnome-tweak-tool

Go to Top Bar on the left and enable date under clock.

You can change setting from terminal too using following command.

$ gsettings set org.gnome.desktop.interface clock-show-date true

Installing "Multi Monitors Add-On" showed topbar on both my displays.

Software Center, search "Multi Monitors Add-On", Install.

Its option "Show Panel on additional monitors" is turned on by default.

Related