将变量的值从控制器传递到另一个控制器

我有两个单独的控制器，PostController用于将输入值返回给刀片并将APIController数据从数据库返回到刀片。我试过传递变量，SESSION但仍然没有功能。请帮忙。

索引.blade.php

<form class="form-inline" action="{{ action('PostController@index') }}" method="GET">
   <div class="form-group">
      <label class="mb-2 mr-sm-2 col-form-label">Date : </label>
         <input type="date" name="date" id="date" style="width:160px;" class="form-control mb-2 mr-sm-2" value="<?php if(isset($_GET['submit'])) echo $_GET['date']; else echo date('Y-m-d');?>">
   </div>
   <input type="submit" name="submit" class="btn btn-primary mb-2" value="Inquiry">
</form>

后控制器.php

<?php
   namespace App\Http\Controllers;

   use Illuminate\Support\Facades\Input;
   use Session;

   class PostController extends Controller
   {
      public function index()
      {     
         $getDate = Input::get('date'); //trying to pass this to APIController for query
         $getCurrentDate = date('Y-m-d');

         Session::put('getDate', $getDate); //for example $getDate = '2019-01-01'

         return view('posts.index')->with('getCurrentDate', $getCurrentDate)->with('getDate', $getDate);
      }
   }

接口控制器.php

<?php    
   namespace App\Http\Controllers;

   use Illuminate\Support\Facades\DB;
   use Yajra\Datatables\Datatables;
   use Session;

   class APIController extends Controller
   {
      public function getQueries()
      {
         ini_set('memory_limit', '1024M');
         ini_set('max_execution_time', 300);

         $getInputDate = Session::get('getDate'); //don't get anything here

         //dd($getInputDate); //have tried dumping, it returns null

         $getCurrentDate = date('Y-m-d');

         if($getInputDate == NULL)
         {
            $query = DB::select(DB::raw("SELECT * FROM TABLE WHERE date = '$getCurrentDate'");

            return Datatables::of($query)->make(true); 
         }
         else 
         {
            $query = DB::select(DB::raw("SELECT * FROM TABLE WHERE date = '$getInputDate'");

            return Datatables::of($query)->make(true);
         }
      }
   }

网页.php

Route::get('/', 'PostController@index');  

Route::group(['middleware' => 'web'], function () {
    // Put routes in here
    Route::get('/json/getQueries', 'APIController@getQueries')->name('api.posts.index');
});

api.php

Route::get('/json/getQueries', 'APIController@getQueries')->name('api.posts.index');

Route::group(['middleware' => 'web'], function () {
    // Put routes in here
    Route::get('/', 'PostController@index'); 
});