The world times are shown in the gnome notification area.
If you open gnome-clocks and add a new world clock, and then click on the notification area in the task-bar, the section showing world times is no longer visible.
If you log out, and log-back-in, the world times are again shown in the gnome notification area, and the newly added time is also shown.
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ApportVersion: 2.20.4-0ubuntu4.1
Architecture: amd64
CurrentDesktop: GNOME
DistroRelease: Ubuntu 17.04
InstallationDate: Installed on 2017-06-10 (0 days ago)
InstallationMedia: Ubuntu-GNOME 17.04.0 2017.06.10 "Custom Zesty Zapus"
NonfreeKernelModules: wl
Package: gnome-clocks 3.24.0-0ubuntu1
PackageArchitecture: amd64
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
Tags: zesty
Uname: Linux 4.10.0-22-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm audio cdrom dialout dip floppy lpadmin plugdev sambashare sudo users video
_MarkForUpload: True
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