How to get a time zone from a location using latitude and longitude coordinates

Question

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

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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     amp timestamp 1331161200 amp 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

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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

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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  gt   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

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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

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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  lt  lt  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  amp  0x80     0x80    b0  amp  0x7F    0x80   b0            int i1     b1  amp  0x80     0x80    b1  amp  0x7F    0x80   b1            int i2     b2  amp  0x80     0x80    b2  amp  0x7F    0x80   b2            int i3     b3  amp  0x80     0x80    b3  amp  0x7F    0x80   b3             return   long i0  lt  lt  24      long i1  lt  lt  16      long i2  lt  lt  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  -- gt  Then NTP returns Time OFFSET since 1900                   private void writeTimeStamp byte   buffer  int offset                     int ofs    offset              for  int i ofs i lt  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 amp timestamp 1331161200 amp sensor false          String request    https   maps googleapis com maps api timezone xml location   Latitude      Longitude    amp timestamp   tsLong    amp sensor false            String xmltext   get xml server reponse request            if xmltext compareTo       0                      int startpos   xmltext indexOf   lt 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

User · Answer

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

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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 amp timestamp 1331161200 amp sensor false          String request    https   maps googleapis com maps api timezone xml location   Latitude      Longitude    amp timestamp   tsLong    amp sensor false            String xmltext   get xml server reponse request            if xmltext compareTo       0                      int startpos   xmltext indexOf   lt 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

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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

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How about this solution for node js https   github com mattbornski tzwhere  And its Python counterpart  https   github com pegler pytzwhere

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For those of us using Javascript and looking to get a timezone from a zip code via Google APIs  here is one method     Fetch the lat lng via geolocation  fetch the timezone by pass that into the timezone API    Using Luxon here for timezone conversion      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

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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 amp timestamp 1331161200                              timezoneurl   timezoneurl  location   lat     lng   amp timestamp 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

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Time Zone Location Web Services  Google Maps Time Zone API Bing Maps Time Zone API Azure Maps Time Zone API GeoNames Time Zone API TimeZoneDB API AskGeo - commercial  but arguably more accurate than GeoNames  GeoGarage Time Zone API - commercial  focusing on Nautical time zones   Raw Time Zone Boundary Data  Timezone Boundary Builder - builds time zone shapefiles from OpenStreetMaps map data  Includes territorial waters near coastlines   The following projects have previously been sources of time zone boundary data  but are no longer actively maintained   tz world - the original shapefile data from Eric Muller whereonearth-timezone - GeoJSON version with WOEDB data merged in  Time Zone Geolocation Offline Implementations Implementations that use the Timezone Boundary Builder data  node-geo-tz - JavaScript library  Node js only  timespace - JavaScript library tz-lookup-oss - JavaScript library GeoTimeZone -  NET library Geo-Timezone - PHP library timezonefinder - Python library ZoneDetect - C library Timeshape - Java library TimeZoneMap - Java and Android library lutz - R library go-tz - Go library Timezone lookup - Go library docker-timezone-lookup -  docker container wrapping node-geo-tz  Implementations that use the older tz world data  latlong - Go library  Read this post also   TimeZoneMapper - Java library tzwhere - JavaScript Node library pytzwhere - Python library timezone finder - Ruby library LatLongToTimeZone - Java and Swift libraries What Time is it here  - Blog post describing PHP and MongoDB rundel timezone - R library  Libraries that call one of the web services  timezone - Ruby gem that calls GeoNames AskGeo has its own libraries for calling from Java or  Net GeoNames has client libraries for just about everything  Self-hosted web services  geo2tz - based on Timezone lookup  available via Docker image  Other Ideas  Find the nearest city with an R-Tree Find the nearest city with MySQL  Please update this list if you know of any others Also  note that the nearest-city approach may not yield the  quot correct quot  result  just an approximation  Conversion To Windows Zones Most of the methods listed will return an IANA time zone id   If you need to convert to a Windows time zone for use with the TimeZoneInfo class in  NET  use the TimeZoneConverter library  Don t use zone tab The tz database includes a file called zone tab   This file is primarily used to present a list of time zones for a user to pick from   It includes the latitude and longitude coordinates for the point of reference for each time zone   This allows a map to be created highlighting these points   For example  see the interactive map shown on the moment-timezone home page  While it may be tempting to use this data to resolve the time zone from a latitude and longitude coordinates  consider that these are points - not boundaries   The best one could do would be to determine the closest point  which in many cases will not be the correct point  Consider the following example                                             The two squares represent different time zones  where the black dot in each square is the reference location  such as what can be found in zone tab   The blue dot represents the location we are attempting to find a time zone for   Clearly  this location is within the orange zone on the left  but if we just look at closest distance to the reference point  it will resolve to the greenish zone on the right

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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   amp lng    Longitude    amp 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   lt 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

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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 amp longitude 34

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x000D   x000D    function jsonpRequest url  data  x000D    x000D      let params       x000D      for  let key in data  x000D        x000D          if  data hasOwnProperty key   x000D            x000D              if  params length    0  x000D                x000D                  params         x000D                x000D              else x000D                x000D                  params      amp    x000D                x000D              let encodedKey   encodeURIComponent key   x000D              let encodedValue   encodeURIComponent data key    x000D              params    encodedKey         encodedValue  x000D             x000D        x000D      let script   document createElement  script    x000D      script src   url   params  x000D      document body appendChild script   x000D    x000D   x000D  function getLocation     x000D    if  navigator geolocation    x000D      navigator geolocation getCurrentPosition showPosition   x000D      else   x000D      x innerHTML    Geolocation is not supported by this browser    x000D      x000D    x000D  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   gt  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   x000D    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      x000D    jsonpRequest url  data  x000D    x000D   sample    x000D     x000D  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   x000D    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   x000D   x000D  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 gt 12   x000D        dif overall gmt diff-12 x000D       x000D     else  x000D       dif overall gmt diff x000D       x000D      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    x000D   x000D  function setRotation element  rotationRatio    x000D    element style setProperty  --rotation   rotationRatio   360  x000D    x000D  function activate clock    x000D  setClock   x000D  setInterval setClock  1000  x000D    x000D        after     before   x000D    box-sizing  border-box  x000D    x000D   x000D  body   x000D    background  linear-gradient to right  hsl 200  100   50    hsl 175  100   50     x000D    display  flex  x000D    justify-content  center  x000D    align-items  center  x000D    min-height  100vh  x000D    overflow  hidden  x000D    x000D   x000D   clock   x000D    width  200px  x000D    height  200px  x000D    background-color  rgba 255  255  255   8   x000D    border-radius  50   x000D    border  2px solid black  x000D    position  relative  x000D    x000D   x000D   clock  number   x000D    --rotation  0  x000D    position  absolute  x000D    width  100   x000D    height  100   x000D    text-align  center  x000D    transform  rotate var --rotation    x000D    font-size  1 5rem  x000D    x000D   x000D   clock  number1   --rotation  30deg    x000D   clock  number2   --rotation  60deg    x000D   clock  number3   --rotation  90deg    x000D   clock  number4   --rotation  120deg    x000D   clock  number5   --rotation  150deg    x000D   clock  number6   --rotation  180deg    x000D   clock  number7   --rotation  210deg    x000D   clock  number8   --rotation  240deg    x000D   clock  number9   --rotation  270deg    x000D   clock  number10   --rotation  300deg    x000D   clock  number11   --rotation  330deg    x000D   x000D   clock  hand   x000D    --rotation  0  x000D    position  absolute  x000D    bottom  50   x000D    left  50   x000D    border  1px solid white  x000D    border-top-left-radius  10px  x000D    border-top-right-radius  10px  x000D    transform-origin  bottom  x000D    z-index  10  x000D    transform  translateX -50   rotate calc var --rotation    1deg    x000D    x000D   x000D   clock  after   x000D    content      x000D    position  absolute  x000D    background-color  black  x000D    z-index  11  x000D    width  15px  x000D    height  15px  x000D    top  50   x000D    left  50   x000D    transform  translate -50   -50    x000D    border-radius  50   x000D    x000D   x000D   clock  hand second   x000D    width  3px  x000D    height  45   x000D    background-color  red  x000D    x000D   x000D   clock  hand minute   x000D    width  7px  x000D    height  40   x000D    background-color  black  x000D    x000D   x000D   clock  hand hour   x000D    width  10px  x000D    height  35   x000D    background-color  black  x000D    x000D   x000D   x000D   x000D   x000D   x000D   x000D   x000D   x000D   x000D   x000D   x000D   x000D   x000D   x000D     Background Styles Only    x000D   x000D   import url  https   fonts googleapis com css family Raleway    x000D   x000D      x000D      font-family  Raleway  x000D    x000D   x000D   side-links   x000D    position  absolute  x000D    top  15px  x000D    right  15px  x000D    x000D   x000D   side-link   x000D    display  flex  x000D    align-items  center  x000D    justify-content  center  x000D    text-decoration  none  x000D    margin-bottom  10px  x000D    color  white  x000D    width  180px  x000D    padding  10px 0  x000D    border-radius  10px  x000D    x000D   x000D   side-link-youtube   x000D    background-color  red  x000D    x000D   x000D   side-link-twitter   x000D    background-color   1DA1F2  x000D    x000D   x000D   side-link-github   x000D    background-color   6e5494  x000D    x000D   x000D   side-link-text   x000D    margin-left  10px  x000D    font-size  18px  x000D    x000D   x000D   side-link-icon   x000D    color  white  x000D    font-size  30px  x000D    x000D      lt input type  text  id  lat id  placeholder  lat  gt  lt br gt  lt br gt  x000D     lt input type  text  id  lng id  placeholder  lng  gt  lt br gt  lt br gt  x000D   lt button class  text  onClick  getLocation    gt Location lt  button gt  x000D   lt button class  text  onClick  getGMT    gt  GMT lt  button gt  x000D   lt button class  text  onClick  activate clock    gt  Activate lt  button gt  x000D   lt div class  clock  gt  x000D     lt div class  hand hour  data-hour-hand gt  lt  div gt  x000D     lt div class  hand minute  data-minute-hand gt  lt  div gt  x000D     lt div class  hand second  data-second-hand gt  lt  div gt  x000D     lt div class  number number1  gt 1 lt  div gt  x000D     lt div class  number number2  gt 2 lt  div gt  x000D     lt div class  number number3  gt 3 lt  div gt  x000D     lt div class  number number4  gt 4 lt  div gt  x000D     lt div class  number number5  gt 5 lt  div gt  x000D     lt div class  number number6  gt 6 lt  div gt  x000D     lt div class  number number7  gt 7 lt  div gt  x000D     lt div class  number number8  gt 8 lt  div gt  x000D     lt div class  number number9  gt 9 lt  div gt  x000D     lt div class  number number10  gt 10 lt  div gt  x000D     lt div class  number number11  gt 11 lt  div gt  x000D     lt div class  number number12  gt 12 lt  div gt  x000D   lt  div gt  x000D   x000D   x000D

User · Answer

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  lt  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  lt   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

User · Answer

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

[geolocation] How to get a time zone from a location using latitude and longitude coordinates?

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