gistfile1.txt

public static function getClosestTimezone($lat, $lng) {
	    $diffs = array();
	    foreach(DateTimeZone::listIdentifiers() as $timezoneID) {
	      $timezone = new DateTimeZone($timezoneID);
	      $location = $timezone->getLocation();
	      $tLat = $location['latitude'];
	      $tLng = $location['longitude'];
	      $diffLat = abs($lat - $tLat);
	      $diffLng = abs($lng - $tLng);
	      $diff = $diffLat + $diffLng;
	      $diffs[$timezoneID] = $diff;
	    }

	    $timezone = array_keys($diffs, min($diffs));

	    return $timezone[0];
   }