Kindle timezone

Hi, anyone knowns how to set timezone in kindle paperwhite (not jailbroken)

This is my problem:

I set time on kindle to 23:51

in javascript/browser i call Date.now() and i get 1546037486922

This is in GMT: Friday, December 28, 2018 22:51:26.922

So my kindle is somewhat in +1 timezone, from where this settings come from?

When i set time on kindle to 22:57 (one hour less)

Date.now() is 1546037913339

This is GMT: Friday, December 28, 2018 22:58:33.339

This give me +0 timezone


It seems kindle is running in GMT and set the timezone from diff time you set and GMT time.

This is very strange behaviour. Anybody have a explanation?