How to add additional clock in Ubuntu 18.04? [duplicate]

It was quite simple in Ubuntu 16.04 to add additional clock from different time zone. But I am not sure how to add in 18.04, I checked the settings but it doesn't have any options. Any suggestions?


There is a programm called gnome-clocks, where you can add timezones.

sudo apt install gnome-clocks

gnome-clocks It will listen these timezones under your calendar.