I noticed today that the clock was missing from the Unity funbar, funny I don’t know how long it was gone 😉
Here are the instructions I found from ask Ubuntu to restore it:
Reinstall indicator-datetime. It should be installed by default, but just in case you have removed it unknowingly, it is best to run the install command again.
sudo apt-get install indicator-datetime
Next, we are going to reconfigure the date time:
sudo dpkg-reconfigure --frontend noninteractive tzdata
Lastly, restart unity.
sudo killall unity-panel-service