I make extensive use of the multiple timezone clock feature in 16.04.
After upgrading to Ubuntu 18.04 I found various guides that installing GNOME Clocks and adding time zones I should see them in the dropdown when I click the clock on the taskbar.
However it isn't showing up in there, despite restarting a few times.
I also installed GNOME Weather and its section shows now in the clock dropdown.
Has anyone else had this problem? Ideas on how to fix this?