In gnome3, however, all these information are lost. I don't know why upgrade to gnome3, it became a detrimental step. A lot of useful information applets get lost. Not only a lot of useful applets got lost, the window animation constantly keep the cpu busy and application response sometime get slow. Something to ponder if I should choose different window manager.
Anyway, in the meantime, let's take a look at alternative to gnome2 world timezone country information. I google and found out gnome-clocks.
Simple GNOME app with stopwatch, timer, and world clock support GNOME Clocks is a simple application to show the time and date in multiple locations and set alarms or timers. A stopwatch is also included.
user@localhost:~$ sudo apt-get install gnome-clocks
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
Use 'apt-get autoremove' to remove it.
The following NEW packages will be installed:
0 upgraded, 1 newly installed, 0 to remove and 691 not upgraded.
Need to get 326 kB of archives.
After this operation, 1,193 kB of additional disk space will be used.
Get:1 http://cdn.debian.net/debian/ unstable/main gnome-clocks amd64 3.14.0-1 [326 kB]
Fetched 326 kB in 4s (66.8 kB/s)
Selecting previously unselected package gnome-clocks.
(Reading database ... 320953 files and directories currently installed.)
Preparing to unpack .../gnome-clocks_3.14.0-1_amd64.deb ...
Unpacking gnome-clocks (3.14.0-1) ...
Processing triggers for libglib2.0-0:i386 (2.42.0-2) ...
Processing triggers for libglib2.0-0:amd64 (2.42.0-2) ...
Processing triggers for hicolor-icon-theme (0.13-1) ...
Processing triggers for gnome-menus (3.13.3-2) ...
Processing triggers for mime-support (3.57) ...
Processing triggers for desktop-file-utils (0.22-1) ...
Setting up gnome-clocks (3.14.0-1) ...
So all goods, let's launch it. You can either launch gnome-clocks using command line or you can launch it from date/time panel. See screenshot below and click on Open Clocks.
As seen below, I have configure a few countries. How to add time for a country is left as an exercise for you and I promise it will not that difficult ;). Unfortunately it does not show information other that just clock. It was a pity anyway. Anyway, better than none until sometime generous enough to develop additional information like weather and graphical earth day and night.
That's it people, I hope you get some nice replacement when you transition into gnome3 environment.