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That's only for system time not home screen clock's additional zones to show, but maybe I could set UTC as system and add my home zone as additional...
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That's provided by the bundled clock app and the widget it provides so you could find a different clock allowing you to select by UTC offset. AOSP DeskClock is actively developed but is just meant to be a basic clock app providing the basics for users and APIs for other apps.
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Google has a proprietary fork of AOSP DeskClock which has substantially diverged and it has UTC as a time zone. AOSP DeskClock could have that feature but the AOSP developers who maintain it mostly just do maintenance and they don't have any vision for the future of the app.
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