¿ Set default time zone for kitchen ROM?

Hello, I am a new android in the kitchen.
I'm trying to set the default time zone for my country in my ROM, now by default is GMT-8.00 and I want to GMT +2.00.

I found the following string in Settings.apk in res / xml / date_time_preferd:
Android:key="timezone" android:title="@string/date_time_set_timezone" <PreferenceScreen android:summary="GMT+2:00" />

I edit, compile apk again but still the time of GMT-8.00.

Do you know any other way to set this default to GMT +2.00 leave?
¿Init.d script?

Thanks and sorry for my English of google

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