Android?
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yes
I dont know of one, but it shouldn't be the worst to make :/ you'd rely on either an internal IP address library somehow or an external service.
You might be able to hack it yourself with Termux
Too complex maybe
I just need a FOSS app that stays in the status bar with customizable clock but it seems that no one has had this need until today
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.