Multiple clocks on desktop

Solution 1:

You can use Screenlets clock widget to show time with different time zone. In the image I am using two clocks with 2 different time zone.

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First you need to install screenlets. Install it using sudo apt-get install screenlets.
Now Open Screenlets manager and add two clock on the desktop.

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Now Right click on the Clock present on your desktop and goto properties -> options -> clocks and set the Time Zone.
Repeat it for other clock.

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You should look into Conky, you could modify it so it shows you different time zones.

Local: $alignr ${time %H:%M:%S}
UTC: $alignr ${utime %H:%M:%S}
CST: $alignr ${tztime /America/Chicago %H:%M:%S}

Would display the Local time, UTC time, and CST time.

Here is the Ubuntu install guide!