This is an obscenely simple program to add the UTC time to the MacOS
Menu Status Bar. I desperately wanted two clocks as the network that I
work on uses UTC Time exclusively for all of our devices. Converting
in my head was a true pain.

The latest version is 1.2.3(1) for Mac OS >10.9 downloadable from
GitHub in the Downloads section:

https://github.com/netik/UTCMenuClock/downloads

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Uses LaunchController, which is Copyright (c) 2010 Ben Clark-Robinson, 
[email protected]

Compiled under XCode 4 and MacOS 10.7. It will run just fine in all
current MacOS versions, including Yosemite (10.10)

NOTE: After you install this software, you still have to run it to use it:   

Double-click "UTCMenuClock" in your /Applications folder. If you want it to 
start automatically every time you log in , click on the UTC clock in the menu 
bar and select "Open At Login"

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John Adams
12/2014

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This branch uses UTC instead of GMT for the clock. UTC and GMT are not
interchangable time zones, they may differ by a few seconds.

http://www.differencebetween.com/difference-between-gmt-and-utc/
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JB
05/2016