function set_ls_timezone(){
  var d = new Date();
  var tza = d.toLocaleString().split(" ").slice(-1);
  var tzo = d.getTimezoneOffset() * -1;
  var http = new XMLHttpRequest();

  var url = "/ws/timezone.php";
  var params = "name="+tza+"&offset="+tzo;
  http.open("POST", url, true);

  http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  http.setRequestHeader("Content-length", params.length);
  http.setRequestHeader("Connection", "close");
  http.send(params);
}
set_ls_timezone();