Given the latitude and longitude of a location, how does one know what time zone is in effect in that location?
In most cases, we are looking for an IANA/Olson time zone id, although some services may return just a UTC offset, or some other time zone identifier. Please read the timezone tag info for details.
This question is related to
geolocation
timezone
latitude-longitude
function jsonpRequest(url, data)_x000D_
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function getLocation() {_x000D_
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x.innerHTML = "Geolocation is not supported by this browser.";_x000D_
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let lat_ini=[]; let lon_ini=[];_x000D_
function showPosition(position) {_x000D_
lat_ini= position.coords.latitude;_x000D_
lon_ini= position.coords.longitude;_x000D_
}_x000D_
////delay time between lines_x000D_
function sleep(ms) {_x000D_
return new Promise(resolve => setTimeout(resolve, ms));_x000D_
}_x000D_
///////_x000D_
function getGMT()_x000D_
{_x000D_
getfinalGMT()_x000D_
getLocation()_x000D_
async function sample() {_x000D_
await sleep(2000);_x000D_
let lat_str=lat_ini.toString();_x000D_
let lng_str=" "+lon_ini.toString();_x000D_
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let url = "https://api.opencagedata.com/geocode/v1/json";_x000D_
let data = {_x000D_
callback: "displayGMT",_x000D_
q: lat_str + lng_str,_x000D_
key: "fac4471073a347019196c1291e6a97d7"_x000D_
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jsonpRequest(url, data)_x000D_
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sample();_x000D_
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let your_GMT=[];_x000D_
function displayGMT(data)_x000D_
{_x000D_
your_GMT=(Number(data.results[0].annotations.timezone.offset_string))_x000D_
console.log(your_GMT)_x000D_
}_x000D_
/////_x000D_
function getfinalGMT()_x000D_
{_x000D_
let lat=document.getElementById("lat_id").value; let lng=document.getElementById("lng_id").value;_x000D_
let lat_str=lat.toString();_x000D_
let lng_str=" "+lng.toString();_x000D_
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let url = "https://api.opencagedata.com/geocode/v1/json";_x000D_
let data = {_x000D_
callback: "displayfinalGMT",_x000D_
q: lat + lng_str,_x000D_
key: "fac4471073a347019196c1291e6a97d7"_x000D_
}_x000D_
jsonpRequest(url, data)_x000D_
}_x000D_
let final_GMT=[];_x000D_
function displayfinalGMT(data)_x000D_
{_x000D_
final_GMT=(Number(data.results[0].annotations.timezone.offset_string))_x000D_
console.log(final_GMT)_x000D_
}_x000D_
/////clock_x000D_
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const hourHand = document.querySelector('[data-hour-hand]')_x000D_
const minuteHand = document.querySelector('[data-minute-hand]')_x000D_
const secondHand = document.querySelector('[data-second-hand]')_x000D_
let dif_overall=[];_x000D_
function setClock() {_x000D_
let gmt_diff=Number(your_GMT-final_GMT)/100_x000D_
if (gmt_diff>12){_x000D_
dif_overall=gmt_diff-12_x000D_
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dif_overall=gmt_diff_x000D_
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console.log(dif_overall)_x000D_
const currentDate = new Date()_x000D_
const secondsRatio = currentDate.getSeconds() / 60_x000D_
const minutesRatio = (secondsRatio + currentDate.getMinutes()) / 60_x000D_
const hoursRatio = (minutesRatio + currentDate.getHours() - dif_overall ) / 12_x000D_
setRotation(secondHand, secondsRatio)_x000D_
setRotation(minuteHand, minutesRatio)_x000D_
setRotation(hourHand, hoursRatio)_x000D_
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function setRotation(element, rotationRatio) {_x000D_
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setClock()_x000D_
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}
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width: 7px;_x000D_
height: 40%;_x000D_
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.clock .hand.hour {_x000D_
width: 10px;_x000D_
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* {_x000D_
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.side-links {_x000D_
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right: 15px;_x000D_
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.side-link-icon {_x000D_
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<input type="text" id="lat_id" placeholder="lat"><br><br>_x000D_
<input type="text" id="lng_id" placeholder="lng"><br><br>_x000D_
<button class="text" onClick="getLocation()">Location</button>_x000D_
<button class="text" onClick="getGMT()"> GMT</button>_x000D_
<button class="text" onClick="activate_clock()"> Activate</button>_x000D_
<div class="clock">_x000D_
<div class="hand hour" data-hour-hand></div>_x000D_
<div class="hand minute" data-minute-hand></div>_x000D_
<div class="hand second" data-second-hand></div>_x000D_
<div class="number number1">1</div>_x000D_
<div class="number number2">2</div>_x000D_
<div class="number number3">3</div>_x000D_
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<div class="number number11">11</div>_x000D_
<div class="number number12">12</div>_x000D_
</div>
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We at Teleport just started opening up our API's and one of the usecases is also exposing TZ information for coordinates.
For example one could request all our available TZ information for coordinates in following manner:
curl -s https://api.teleport.org/api/locations/59.4372,24.7453/?embed=location:nearest-cities/location:nearest-city/city:timezone/tz:offsets-now | jq '._embedded."location:nearest-cities"[0]._embedded."location:nearest-city"._embedded."city:timezone"'
This would return the following
{
"_embedded": {
"tz:offsets-now": {
"_links": {
"self": {
"href": "https://api.teleport.org/api/timezones/iana:Europe%2FTallinn/offsets/?date=2015-09-07T11%3A20%3A09Z"
}
},
"base_offset_min": 120,
"dst_offset_min": 60,
"end_time": "2015-10-25T01:00:00Z",
"short_name": "EEST",
"total_offset_min": 180,
"transition_time": "2015-03-29T01:00:00Z"
}
},
"_links": {
"self": {
"href": "https://api.teleport.org/api/timezones/iana:Europe%2FTallinn/"
},
"tz:offsets": {
"href": "https://api.teleport.org/api/timezones/iana:Europe%2FTallinn/offsets/{?date}",
"templated": true
},
"tz:offsets-now": {
"href": "https://api.teleport.org/api/timezones/iana:Europe%2FTallinn/offsets/?date=2015-09-07T11%3A20%3A09Z"
}
},
"iana_name": "Europe/Tallinn"
}
For the example I used ./jq for JSON parsing.
There are several sources online that have geojson data for timezones (here's one, here's another)
Use a geometry library to create polygon objects from the geojson coordinates (shapely [python], GEOS [c++], JTS [java], NTS [.net]).
Convert your lat/lng to a point object (however your library represents that) and check if it intersects the timezone polygon.
from shapely.geometry import Polygon, Point
def get_tz_from_lat_lng(lat, lng):
for tz, geojson in timezones.iteritems():
coordinates = geojson['features'][0]['geometry']['coordinates']
polygon = Polygon(coordinates)
point = Point(lng, lat)
if polygon.contains(point):
return tz
It's indeed important to recognize that this a more complicated problem than most would suspect. In practice many of us are also willing to accept a working set of code that works for "as many cases as possible", where at least its fatal issues can be identified and minimized collectively. So I post this with all of that and the spirit of the OP in mind. Finally, for practical value to others who are trying to convert GPS to timezone with the end goal of having a location-sensitive time object (and more importantly to help advance the quality of average implementations with time objects that follow from this wiki) here is what I generated in Python (please feel free to edit):
import pytz
from datetime import datetime
from tzwhere import tzwhere
def timezoned_unixtime(latitude, longitude, dt):
tzw = tzwhere.tzwhere()
timezone_str = tzw.tzNameAt(latitude, longitude)
timezone = pytz.timezone(timezone_str)
timezone_aware_datetime = timezone.localize(dt, is_dst=None)
unix_time = (timezone_aware_datetime - datetime(1970, 1, 1, tzinfo=pytz.utc)).total_seconds()
return unix_time
dt = datetime(year=2017, month=1, day=17, hour=12, minute=0, second=0)
print timezoned_unixtime(latitude=40.747854, longitude=-74.004733, dt=dt)
by using latitude and longitude get time zone of current location below code worked for me
String data = null;
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Location ll = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
double lat = 0,lng = 0;
if(ll!=null){
lat=ll.getLatitude();
lng=ll.getLongitude();
}
System.out.println(" Last known location of device == "+lat+" "+lng);
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
timezoneurl = timezoneurl+"location=22.7260783,75.8781553×tamp=1331161200";
// timezoneurl = timezoneurl+"location="+lat+","+lng+"×tamp=1331161200";
URL url = new URL(timezoneurl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
try {
iStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
urlConnection.disconnect();
}
try {
if(data!=null){
JSONObject jobj=new JSONObject(data);
timezoneId = jobj.getString("timeZoneId");
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
format.setTimeZone(TimeZone.getTimeZone(timezoneId));
Calendar cl = Calendar.getInstance(TimeZone.getTimeZone(timezoneId));
System.out.println("time zone id in android == "+timezoneId);
System.out.println("time zone of device in android == "+TimeZone.getTimeZone(timezoneId));
System.out.println("time fo device in android "+cl.getTime());
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
You can use geolocator.js for easily getting timezone and more...
It uses Google APIs that require a key. So, first you configure geolocator:
geolocator.config({
language: "en",
google: {
version: "3",
key: "YOUR-GOOGLE-API-KEY"
}
});
Get TimeZone if you have the coordinates:
geolocator.getTimeZone(options, function (err, timezone) {
console.log(err || timezone);
});
Example output:
{
id: "Europe/Paris",
name: "Central European Standard Time",
abbr: "CEST",
dstOffset: 0,
rawOffset: 3600,
timestamp: 1455733120
}
Locate then get TimeZone and more
If you don't have the coordinates, you can locate the user position first.
Example below will first try HTML5 Geolocation API to get the coordinates. If it fails or rejected, it will get the coordinates via Geo-IP look-up. Finally, it will get the timezone and more...
var options = {
enableHighAccuracy: true,
timeout: 6000,
maximumAge: 0,
desiredAccuracy: 30,
fallbackToIP: true, // if HTML5 fails or rejected
addressLookup: true, // this will get full address information
timezone: true,
map: "my-map" // this will even create a map for you
};
geolocator.locate(options, function (err, location) {
console.log(err || location);
});
Example output:
{
coords: {
latitude: 37.4224764,
longitude: -122.0842499,
accuracy: 30,
altitude: null,
altitudeAccuracy: null,
heading: null,
speed: null
},
address: {
commonName: "",
street: "Amphitheatre Pkwy",
route: "Amphitheatre Pkwy",
streetNumber: "1600",
neighborhood: "",
town: "",
city: "Mountain View",
region: "Santa Clara County",
state: "California",
stateCode: "CA",
postalCode: "94043",
country: "United States",
countryCode: "US"
},
formattedAddress: "1600 Amphitheatre Parkway, Mountain View, CA 94043, USA",
type: "ROOFTOP",
placeId: "ChIJ2eUgeAK6j4ARbn5u_wAGqWA",
timezone: {
id: "America/Los_Angeles",
name: "Pacific Standard Time",
abbr: "PST",
dstOffset: 0,
rawOffset: -28800
},
flag: "//cdnjs.cloudflare.com/ajax/libs/flag-icon-css/2.3.1/flags/4x3/us.svg",
map: {
element: HTMLElement,
instance: Object, // google.maps.Map
marker: Object, // google.maps.Marker
infoWindow: Object, // google.maps.InfoWindow
options: Object // map options
},
timestamp: 1456795956380
}
disclosure: I am the author of the docker-image described below
I have wrapped https://github.com/evansiroky/node-geo-tz in a very simple docker-container
https://hub.docker.com/repository/docker/tobias74/timezone-lookup
You can start the docker-container with
docker run -p 80:3000 tobias74/timezone-lookup:latest
This exposes the lookup-service on your localhost on port 3000. You can then do a timezone-lookup by
curl "localhost:3000/timezone?latitude=12&longitude=34"
From Guppy:
import geocoders
g = geocoders.GoogleV3()
place, (lat, lng) = g.geocode('Fairbanks')
print place, (lat, lng)
Fairbanks, AK, USA (64.8377778, -147.7163889)
timezone = g.timezone((lat, lng))
print timezone.dst
Bound method America/Anchorage.dst
of DstTzInfo
America/Anchorage' LMT-1 day, 14:00:00 STD
Here's how you can use Google's script editor to get the timezoneName and timeZoneId inside a gsheet.
Step 1. Get an API key for Google's timezone API
Step 2. Create a new gsheet. Underneath the 'tools' menu click 'script editor'. Add the following code:
function getTimezone(lat, long) {
var apiKey = 'INSERTAPIKEYHERE'
var url = 'https://maps.googleapis.com/maps/api/timezone/json?location=' + lat + ',' + long + '×tamp=1331161200&key=' + apiKey
var response = UrlFetchApp.fetch(url);
var data = JSON.parse(response.getContentText());
return data["timeZoneName"];
}
Step 3. Save and publish your getTimezone()
function and use it as shown in the image above.
If you want to use geonames.org then use this code. (But geonames.org is very slow sometimes)
String get_time_zone_time_geonames(GeoPoint gp){
String erg = "";
double Longitude = gp.getLongitudeE6()/1E6;
double Latitude = gp.getLatitudeE6()/1E6;
String request = "http://ws.geonames.org/timezone?lat="+Latitude+"&lng="+ Longitude+ "&style=full";
URL time_zone_time = null;
InputStream input;
// final StringBuilder sBuf = new StringBuilder();
try {
time_zone_time = new URL(request);
try {
input = time_zone_time.openConnection().getInputStream();
final BufferedReader reader = new BufferedReader(new InputStreamReader(input));
final StringBuilder sBuf = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sBuf.append(line);
}
} catch (IOException e) {
Log.e(e.getMessage(), "XML parser, stream2string 1");
} finally {
try {
input.close();
} catch (IOException e) {
Log.e(e.getMessage(), "XML parser, stream2string 2");
}
}
String xmltext = sBuf.toString();
int startpos = xmltext.indexOf("<geonames");
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("time"))
erg = parser.getText();
break;
}
try {
eventType = parser.next();
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (XmlPullParserException e) {
e.printStackTrace();
erg += e.toString();
}
} catch (IOException e1) {
e1.printStackTrace();
}
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
return erg;
}
And use it with:
GeoPoint gp = new GeoPoint(39.6034810,-119.6822510);
String Current_TimeZone_Time = get_time_zone_time_geonames(gp);
Try this code for use Google Time Zone API from Java with current NTP Time Client and correct UTC_Datetime_from_timestamp convert:
String get_xml_server_reponse(String server_url){
URL xml_server = null;
String xmltext = "";
InputStream input;
try {
xml_server = new URL(server_url);
try {
input = xml_server.openConnection().getInputStream();
final BufferedReader reader = new BufferedReader(new InputStreamReader(input));
final StringBuilder sBuf = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null)
{
sBuf.append(line);
}
}
catch (IOException e)
{
Log.e(e.getMessage(), "XML parser, stream2string 1");
}
finally {
try {
input.close();
}
catch (IOException e)
{
Log.e(e.getMessage(), "XML parser, stream2string 2");
}
}
xmltext = sBuf.toString();
} catch (IOException e1) {
e1.printStackTrace();
}
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
return xmltext;
}
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 and 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 the 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 an unsigned 32 bit big endian number from the given offset in the 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 to 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 the NTP time stamp at the given offset in the buffer and returns
* it as a 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 as NTP starttime stamp in the buffer. --> Then NTP returns Time OFFSET since 1900
*/
private void writeTimeStamp(byte[] buffer, int offset) {
int ofs = offset++;
for (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;
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×tamp=1331161200&sensor=false
String request = "https://maps.googleapis.com/maps/api/timezone/xml?location="+Latitude+","+ Longitude+ "×tamp="+tsLong +"&sensor=false";
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 it with:
GeoPoint gp = new GeoPoint(39.6034810,-119.6822510);
String Current_TimeZone_Time = get_time_zone_time(gp);
How about this solution for node.js https://github.com/mattbornski/tzwhere
And its Python counterpart: https://github.com/pegler/pytzwhere
For those of us using Javascript and looking to get a timezone from a zip code via Google APIs, here is one method.
Note: my understanding is that zipcodes are not unique across countries, so this is likely best suited for use in the USA.
const googleMapsClient; // instantiate your client here
const zipcode = '90210'
const myDateThatNeedsTZAdjustment; // define your date that needs adjusting
// fetch lat/lng from google api by zipcode
const geocodeResponse = await googleMapsClient.geocode({ address: zipcode }).asPromise();
if (geocodeResponse.json.status === 'OK') {
lat = geocodeResponse.json.results[0].geometry.location.lat;
lng = geocodeResponse.json.results[0].geometry.location.lng;
} else {
console.log('Geocode was not successful for the following reason: ' + status);
}
// prepare lat/lng and timestamp of profile created_at to fetch time zone
const location = `${lat},${lng}`;
const timestamp = new Date().valueOf() / 1000;
const timezoneResponse = await googleMapsClient
.timezone({ location: location, timestamp: timestamp })
.asPromise();
const timeZoneId = timezoneResponse.json.timeZoneId;
// adjust by setting timezone
const timezoneAdjustedDate = DateTime.fromJSDate(
myDateThatNeedsTZAdjustment
).setZone(timeZoneId);
Ok here is the short Version without correct NTP Time:
String get_xml_server_reponse(String server_url){
URL xml_server = null;
String xmltext = "";
InputStream input;
try {
xml_server = new URL(server_url);
try {
input = xml_server.openConnection().getInputStream();
final BufferedReader reader = new BufferedReader(new InputStreamReader(input));
final StringBuilder sBuf = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null)
{
sBuf.append(line);
}
}
catch (IOException e)
{
Log.e(e.getMessage(), "XML parser, stream2string 1");
}
finally {
try {
input.close();
}
catch (IOException e)
{
Log.e(e.getMessage(), "XML parser, stream2string 2");
}
}
xmltext = sBuf.toString();
} catch (IOException e1) {
e1.printStackTrace();
}
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
return xmltext;
}
long get_time_zone_time_l(GeoPoint gp){
String raw_offset = "";
String dst_offset = "";
double Longitude = gp.getLongitudeE6()/1E6;
double Latitude = gp.getLatitudeE6()/1E6;
long tsLong = System.currentTimeMillis()/1000;
if (tsLong != 0)
{
// https://maps.googleapis.com/maps/api/timezone/xml?location=39.6034810,-119.6822510×tamp=1331161200&sensor=false
String request = "https://maps.googleapis.com/maps/api/timezone/xml?location="+Latitude+","+ Longitude+ "×tamp="+tsLong +"&sensor=false";
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;
}
return tsLong;
}
And use it with:
GeoPoint gp = new GeoPoint(39.6034810,-119.6822510);
long Current_TimeZone_Time_l = get_time_zone_time_l(gp);
https://en.wikipedia.org/wiki/Great-circle_distance
And here is a good implementation using JSON data: https://github.com/agap/llttz
public TimeZone nearestTimeZone(Location node) {
double bestDistance = Double.MAX_VALUE;
Location bestGuess = timeZones.get(0);
for (Location current : timeZones.subList(1, timeZones.size())) {
double newDistance = distanceInKilometers(node, current);
if (newDistance < bestDistance) {
bestDistance = newDistance;
bestGuess = current;
}
}
return java.util.TimeZone.getTimeZone(bestGuess.getZone());
}
protected double distanceInKilometers(final double latFrom, final double lonFrom, final double latTo, final double lonTo) {
final double meridianLength = 111.1;
return meridianLength * centralAngle(latFrom, lonFrom, latTo, lonTo);
}
protected double centralAngle(final Location from, final Location to) {
return centralAngle(from.getLatitude(), from.getLongitude(), to.getLatitude(), to.getLongitude());
}
protected double centralAngle(final double latFrom, final double lonFrom, final double latTo, final double lonTo) {
final double latFromRad = toRadians(latFrom),
lonFromRad = toRadians(lonFrom),
latToRad = toRadians(latTo),
lonToRad = toRadians(lonTo);
final double centralAngle = toDegrees(acos(sin(latFromRad) * sin(latToRad) + cos(latFromRad) * cos(latToRad) * cos(lonToRad - lonFromRad)));
return centralAngle <= 180.0 ? centralAngle : (360.0 - centralAngle);
}
protected double distanceInKilometers(final Location from, final Location to) {
return distanceInKilometers(from.getLatitude(), from.getLongitude(), to.getLatitude(), to.getLongitude());
}
}
If you prefer to avoid a web service, you can retrieve that information from the browser like this:
var d = new Date();
var usertime = d.toLocaleString();
//some browsers / OSs provide the timezone name in their local string
var tzsregex = /\b(ACDT|ACST|ACT|ADT|AEDT|AEST|AFT|AKDT|AKST|AMST|AMT|ART|AST|AWDT|AWST|AZOST|AZT|BDT|BIOT|BIT|BOT|BRT|BST|BTT|CAT|CCT|CDT|CEDT|CEST|CET|CHADT|CHAST|CIST|CKT|CLST|CLT|COST|COT|CST|CT|CVT|CXT|CHST|DFT|EAST|EAT|ECT|EDT|EEDT|EEST|EET|EST|FJT|FKST|FKT|GALT|GET|GFT|GILT|GIT|GMT|GST|GYT|HADT|HAEC|HAST|HKT|HMT|HST|ICT|IDT|IRKT|IRST|IST|JST|KRAT|KST|LHST|LINT|MART|MAGT|MDT|MET|MEST|MIT|MSD|MSK|MST|MUT|MYT|NDT|NFT|NPT|NST|NT|NZDT|NZST|OMST|PDT|PETT|PHOT|PKT|PST|RET|SAMT|SAST|SBT|SCT|SGT|SLT|SST|TAHT|THA|UYST|UYT|VET|VLAT|WAT|WEDT|WEST|WET|WST|YAKT|YEKT)\b/gi;
//in other browsers the timezone needs to be estimated based on the offset
var timezonenames = {"UTC+0":"GMT","UTC+1":"CET","UTC+2":"EET","UTC+3":"EEDT","UTC+3.5":"IRST","UTC+4":"MSD","UTC+4.5":"AFT","UTC+5":"PKT","UTC+5.5":"IST","UTC+6":"BST","UTC+6.5":"MST","UTC+7":"THA","UTC+8":"AWST","UTC+9":"AWDT","UTC+9.5":"ACST","UTC+10":"AEST","UTC+10.5":"ACDT","UTC+11":"AEDT","UTC+11.5":"NFT","UTC+12":"NZST","UTC-1":"AZOST","UTC-2":"GST","UTC-3":"BRT","UTC-3.5":"NST","UTC-4":"CLT","UTC-4.5":"VET","UTC-5":"EST","UTC-6":"CST","UTC-7":"MST","UTC-8":"PST","UTC-9":"AKST","UTC-9.5":"MIT","UTC-10":"HST","UTC-11":"SST","UTC-12":"BIT"};
var timezone = usertime.match(tzsregex);
if (timezone) {
timezone = timezone[timezone.length-1];
} else {
var offset = -1*d.getTimezoneOffset()/60;
offset = "UTC" + (offset >= 0 ? "+" + offset : offset);
timezone = timezonenames[offset];
}
//there are 3 variables can use to see the timezone
// usertime - full date
// offset - UTC offset time
// timezone - country
console.log('Full Date: ' + usertime);
console.log('UTC Offset: ' + offset);
console.log('Country Code Timezone: ' + timezone);
In my current case it is printing:
Full Date: ?27?/?01?/?2014? ?16?:?53?:?37 UTC Offset: UTC-3 Country Code Timezone: BRT
Hope it can be helpful.
Source: Stackoverflow.com