问如何修复-更改到达时间不会更改到达目的地的时间长度

EN

function GOOGLEMAPS(start_address,end_address,return_type,arrive_time) { 
var mapObj = Maps.newDirectionFinder();
  mapObj.setOrigin(start_address);
  mapObj.setDestination(end_address);
  mapObj.setArrive(arrive_time);
  var directions = mapObj.getDirections();

  var getTheLeg = directions["routes"][0]["legs"][0];

  var meters = getTheLeg["distance"]["value"];

  switch(return_type){
    case "miles":
      return meters * 0.000621371;
      break;
    case "minutes":
        // get duration in seconds
        var duration = getTheLeg["duration"]["value"];
        //convert to minutes and return
        return duration / 60;
      break;
    case "hours":
        // get duration in seconds
        var duration = getTheLeg["duration"]["value"];
        //convert to hours and return
        return duration / 60 / 60;
      break;      
    case "kilometers":
      return meters / 1000;
      break;
    default:
      return "Error: Wrong Unit Type";
   }

}