How to change time display to 12h time format in Ubuntu

There are several ways:

From GUI (Settings):

Open Settings >Details> Date & Time. Then pick either 24 hrs or am/pm
From GUI (using dconf-editor)

Open dconf Editor (not installed by default, run
```
sudo apt install dconf-editor
```
to install), and browse to org > gnome > desktop > interface > clock-format, and change the format to '12h'

From command line:

Run the command:

gsettings set org.gnome.desktop.interface clock-format '12h'

To revert:

gsettings set org.gnome.desktop.interface clock-format '24h'

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