Where does Android take default timezone from?

Question

Where does Android device take default timezone from?

Example - you boot a brand new Android device and there is Setup Wizard with \"Date & time\" activity where

Answer 1

It's a build flag that's baked into the ROM (it becomes a system property).

It's in quite a few places so the easiest is to download the AOSP source and grep for:

persist.sys.timezone

A bit more info here: https://stackoverflow.com/search?q=persist.sys.timezone