给定一个位置的经度和纬度，如何知道该位置的有效时区?
在大多数情况下，我们正在寻找IANA/Olson时区id，尽管有些服务可能只返回UTC偏移量或其他一些时区标识符。详细信息请阅读时区标签信息。
当前回答
我写了一个包https://github.com/ringsaturn/tzf支持获取时区在Go&Python和非常快:
package main
import (
"fmt"
"github.com/ringsaturn/tzf"
)
func main() {
finder, err := tzf.NewDefaultFinder()
if err != nil {
panic(err)
}
fmt.Println(finder.GetTimezoneName(116.6386, 40.0786))
}
Python https://github.com/ringsaturn/tzfpy sample:
from tzfpy import get_tz
print(get_tz(121.4737, 31.2305))
Rust https://github.com/ringsaturn/tzf-rs样品:
use tzf_rs::DefaultFinder;
fn main() {
let finder = DefaultFinder::new();
print!("{:?}\n", DefaultFinder.get_tz_name(116.3883, 39.9289));
}
其他回答
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
如果您想使用geonames.org，请使用这段代码。(但是geonames.org有时很慢)
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;
}
并将其用于:
GeoPoint gp = new GeoPoint(39.6034810,-119.6822510);
String Current_TimeZone_Time = get_time_zone_time_geonames(gp);
https://en.wikipedia.org/wiki/Great-circle_distance
下面是一个使用JSON数据的很好的实现: 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());
}
}
好的，这是没有正确NTP时间的短版本:
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;
}
并将其用于:
GeoPoint gp = new GeoPoint(39.6034810,-119.6822510);
long Current_TimeZone_Time_l = get_time_zone_time_l(gp);
从古比鱼:
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
美国/安克雷奇。DstTzInfo的dst
美国/主播LMT-1天，STD 1400:00
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