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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.

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Time synchronization via Wifi/Ethernet bases on the NTP protocol. All NTP server are running with UTC time, hence they can not provide a time zone.

If if they would the time-zone would be useless, as an NTP server can be located anywhere in the world. Typically one NTP DNS name consists on multiple NTP servers, and based on a region the closest server is selected, but that still does not mean that the server is located in the same time-zone as you are.

Only the cellular network has the Network Identity and Time Zone (NITZ) service which provides not only time but also the current time-zone. As a mobile network cell is limited to a very small area it is possible to deliver correct time zone data via cellular.

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