[feature] automatically detect timezone of clock via internet

[techniccontroller]

Possible solution:

1. Get via timezone string via API request: https://networkengineering.stackexchange.com/questions/23761/how-to-get-local-time-from-internet

2. Convert timezone string into offset: https://github.com/bxparks/AceTime

[BramWerbrouck]

Can this do the trick?

void getTimeZone() {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin("http://ip-api.com/json/");
    int httpCode = http.GET();

    if (httpCode == 200) { // HTTP OK
      String payload = http.getString();
      Serial.println("Received data:");
      Serial.println(payload);

      int tzIndex = payload.indexOf("\"timezone\":\"");
      if (tzIndex != -1) {
        int tzStart = tzIndex + 12; 
        int tzEnd = payload.indexOf("\"", tzStart);
        String timezone = payload.substring(tzStart, tzEnd);
        Serial.println("Timezone: " + timezone);
      }
    } else {
      Serial.println("Error: " + String(httpCode));
    }
    http.end();
  }
}

[techniccontroller]

Thank you very much. I have already used another API in a dev branch, but this one is much more efficient.
I will most likely release a new code version this weekend, including this feature.