The official source code for Serenum API. https://api.serenum.org
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<?php
class ConvertGeolocationToTimezone
{
/**
* @param string $cur_lat
* @param string $cur_long
* @param string $country_code
* @return mixed|string
*/
public function getNearestTimezone(string $cur_lat, string $cur_long, string $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';
}
}
?>