Route::get('/','MainController@Date');
Route::post('/','MainController@Date');

Route::any('/','MainController@Date');

$date1 = $request->get ( 'date1' );
$date2 = $request->get ( 'date2' );

$date1 = will calculate using date function
$date2 = will calculate using date function

<?php

namespace AppHttpControllers;

use IlluminateHttpRequest;
use IlluminateRoutingController;

class SmeController extends Controller
{
    /**
     * Do somthing
     * @param  Request  $request
     */
    public function update(Request $request)
    {
        if ($request->isMethod('post')) {
    //
        }
        if ($request->isMethod('get')) {
    //
        }
    }
}

public function someMethod(Request $request)
{
        $method = $request->method();

        // to check if its a post method
        if ($request->isMethod('post')) {
            //
        }

        // to check if its a get method
        if ($request->isMethod('get')) {
            //
        }
}

$request->query();//return only GET param
$request->request->all()// POST param
$request->input();//all