Xiaomi Android Phone... yep as I wrote, I've already tried your modified apps 1.1.6.0 and 1.1.5.1 and time is still set like permanently for Chinese time zone.
Edit: I was thinking about flashing firmware also, but I received Hey+ already with newest firmware, so it is not possible to flash it with your modified firmware. It says "up to date".
I am not sure where is the problem, if it's in app, hey+ firmware, some setting in phone or wtf... :-/