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Status bar customizable world clock
(discuss.tchncs.de)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Ah, you specified Android.
Should be relatively simple with a shell script. Considering Android's security model the hardest bit will probably be to get that timezone out of the VPN app.
And then maybe some app exists that allows you to integrate custom script output into your staus bar.