android - TimeZone based on location -

i have following code:

            msavedtime = new time();//????always returns america/new york         double latitude = 40.09596;         double longitude = -74.22213;         double elevation = 0;         timezone timezone = timezone.gettimezone(msavedtime.timezone); 

my first question is: how elevation information lat\lon combination? second question is: how timezone string lon\lan combination? above code provide timezone string clock on cell phone set (returns america/new york). want string according lat\lon setup me.

try code use google time zone api:

 private string get_utc_datetime_from_timestamp(long timestamp){      try{          calendar cal = calendar.getinstance();         timezone tz = cal.gettimezone();          int tzt = tz.getoffset(system.currenttimemillis());          timestamp -= tzt;          // dateformat sdf = new simpledateformat("yyyy-mm-dd hh:mm:ss",locale.getdefault());         dateformat sdf = new simpledateformat();         date netdate = (new date(timestamp));         return sdf.format(netdate);     }     catch(exception ex){         return "";      }     }    class ntp_utc_time  {      private static final string tag = "sntpclient";       private static final int receive_time_offset = 32;      private static final int transmit_time_offset = 40;      private static final int ntp_packet_size = 48;       private static final int ntp_port = 123;      private static final int ntp_mode_client = 3;      private static final int ntp_version = 3;       // number of seconds between jan 1, 1900 , jan 1, 1970      // 70 years plus 17 leap days      private static final long offset_1900_to_1970 = ((365l * 70l) + 17l) * 24l * 60l * 60l;       private long mntptime;       public boolean requesttime(string host, int timeout) {          try {              datagramsocket socket = new datagramsocket();              socket.setsotimeout(timeout);              inetaddress address = inetaddress.getbyname(host);              byte[] buffer = new byte[ntp_packet_size];              datagrampacket request = new datagrampacket(buffer, buffer.length, address, ntp_port);               buffer[0] = ntp_mode_client | (ntp_version << 3);               writetimestamp(buffer, transmit_time_offset);               socket.send(request);               // read response              datagrampacket response = new datagrampacket(buffer, buffer.length);              socket.receive(response);                        socket.close();               mntptime = readtimestamp(buffer, receive_time_offset);                      } catch (exception e) {            //  if (config.logd) log.d(tag, "request time failed: " + e);              return false;          }           return true;      }        public long getntptime() {          return mntptime;      }        /**       * reads unsigned 32 bit big endian number given offset in buffer.       */      private long read32(byte[] buffer, int offset) {          byte b0 = buffer[offset];          byte b1 = buffer[offset+1];          byte b2 = buffer[offset+2];          byte b3 = buffer[offset+3];           // convert signed bytes unsigned values          int i0 = ((b0 & 0x80) == 0x80 ? (b0 & 0x7f) + 0x80 : b0);          int i1 = ((b1 & 0x80) == 0x80 ? (b1 & 0x7f) + 0x80 : b1);          int i2 = ((b2 & 0x80) == 0x80 ? (b2 & 0x7f) + 0x80 : b2);          int i3 = ((b3 & 0x80) == 0x80 ? (b3 & 0x7f) + 0x80 : b3);           return ((long)i0 << 24) + ((long)i1 << 16) + ((long)i2 << 8) + (long)i3;      }       /**       * reads ntp time stamp @ given offset in buffer , returns        * system time (milliseconds since january 1, 1970).       */          private long readtimestamp(byte[] buffer, int offset) {          long seconds = read32(buffer, offset);          long fraction = read32(buffer, offset + 4);          return ((seconds - offset_1900_to_1970) * 1000) + ((fraction * 1000l) / 0x100000000l);              }       /**       * writes 0 ntp starttime stamp in buffer. --> ntp returns time offset since 1900       */          private void writetimestamp(byte[] buffer, int offset) {                  int ofs =  offset++;           (int i=ofs;i<(ofs+8);i++)            buffer[i] = (byte)(0);                   }   }   string get_time_zone_time(geopoint gp){          string erg = "";         string raw_offset = "";         string dst_offset = "";          double longitude = gp.getlongitudee6()/1e6;         double latitude = gp.getlatitudee6()/1e6;          // string request = "http://ws.geonames.org/timezone?lat="+latitude+"&lng="+ longitude+ "&style=full";           long tslong = 0; // system.currenttimemillis()/1000;          ntp_utc_time client = new ntp_utc_time();          if (client.requesttime("pool.ntp.org", 2000)) {                         tslong = client.getntptime();         }          if (tslong != 0)         {          tslong = tslong  / 1000;          // https://maps.googleapis.com/maps/api/timezone/xml?location=39.6034810,-119.6822510&timestamp=1331161200&sensor=true          string request = "https://maps.googleapis.com/maps/api/timezone/xml?location="+latitude+","+ longitude+ "&timestamp="+tslong +"&sensor=true";          string xmltext = get_xml_server_reponse(request);          if(xmltext.compareto("")!= 0)         {           int startpos = xmltext.indexof("<timezoneresponse");          xmltext = xmltext.substring(startpos);            xmlpullparser parser;         try {             parser = xmlpullparserfactory.newinstance().newpullparser();                parser.setinput(new stringreader (xmltext));               int eventtype = parser.geteventtype();                 string tagname = "";                while(eventtype != xmlpullparser.end_document) {                  switch(eventtype) {                       case xmlpullparser.start_tag:                             tagname = parser.getname();                           break;                        case xmlpullparser.text :                           if  (tagname.equalsignorecase("raw_offset"))                           if(raw_offset.compareto("")== 0)                                                            raw_offset = parser.gettext();                            if  (tagname.equalsignorecase("dst_offset"))                           if(dst_offset.compareto("")== 0)                             dst_offset = parser.gettext();                             break;                      }                   try {                         eventtype = parser.next();                     } catch (ioexception e) {                          e.printstacktrace();                     }                  }                  } catch (xmlpullparserexception e) {                      e.printstacktrace();                     erg += e.tostring();                 }          }                int ro = 0;         if(raw_offset.compareto("")!= 0)         {              float rof = str_to_float(raw_offset);             ro = (int)rof;         }          int dof = 0;         if(dst_offset.compareto("")!= 0)         {              float doff = str_to_float(dst_offset);             dof = (int)doff;         }          tslong = (tslong + ro + dof) * 1000;            erg = get_utc_datetime_from_timestamp(tslong);         }     return erg;  } 

and use with:

geopoint gp = new geopoint(39.6034810,-119.6822510); string current_timezone_time = get_time_zone_time(gp);