Get PHP Timezone Name from Latitude and Longitude? [duplicate]

Question

Is there a way get the timezone of a user by their latitude and longitude? And not just the offset, but the actual timezone they're in.

Essentially, I'm searching for the polar opposite of DateTimeZone::getLocation which returns the latitude and longitude for a certain timezone.

Answer 1

For those who wants to get timezone from country code, latitude and longitude. ( easy to get it if you have a geoip module installed on your server )

Try this, I've added a distance calculation - only for those countries which has multiple timezones. Ah, and the country code is a two letter ISO code.

// ben@jp  function get_nearest_timezone($cur_lat, $cur_long, $country_code = '') {     $timezone_ids = ($country_code) ? DateTimeZone::listIdentifiers(DateTimeZone::PER_COUNTRY, $country_code)                                     : DateTimeZone::listIdentifiers();      if($timezone_ids && is_array($timezone_ids) && isset($timezone_ids[0])) {          $time_zone = '';         $tz_distance = 0;          //only one identifier?         if (count($timezone_ids) == 1) {             $time_zone = $timezone_ids[0];         } else {              foreach($timezone_ids as $timezone_id) {                 $timezone = new DateTimeZone($timezone_id);                 $location = $timezone->getLocation();                 $tz_lat   = $location['latitude'];                 $tz_long  = $location['longitude'];                  $theta    = $cur_long - $tz_long;                 $distance = (sin(deg2rad($cur_lat)) * sin(deg2rad($tz_lat)))                  + (cos(deg2rad($cur_lat)) * cos(deg2rad($tz_lat)) * cos(deg2rad($theta)));                 $distance = acos($distance);                 $distance = abs(rad2deg($distance));                 // echo '<br />'.$timezone_id.' '.$distance;                   if (!$time_zone || $tz_distance > $distance) {                     $time_zone   = $timezone_id;                     $tz_distance = $distance;                 }               }         }         return  $time_zone;     }     return 'unknown'; } //timezone for one NY co-ordinate echo get_nearest_timezone(40.772222,-74.164581) ; // more faster and accurate if you can pass the country code  echo get_nearest_timezone(40.772222, -74.164581, 'US') ; 

Answer 2

Geonames should do the job nicely:

http://www.geonames.org/

They've also got a php library.