Timezone is not updating with WiFi and ethernet network in Android

I am working with Android **AOSP**. When I connect my Android device with **cellular network**, then the timezone is updating (if I enable the "auto-update time zone" option). But if I connect my device with **WiFi** or **ethernet network**, then the timezone is not updating (even if the "auto-update time zone" option is enabled). I studied some forums, they are saying that the timezone will not update with WiFi and ethernet network. Is it right? Please give some summary regarding this issue.