dd（$request->all());

array:4 [▼
  "_token" => "bq47HKXwagwBK0BexD0kKeKhacYWKdYBKkiTvsWh"
  "title" => "45"
  "content" => "34"
  "published_at" => "2017-07-31"
]

存入数据库的published_at的数据和created_at的数据一样

附上

public function store(Request $request)
    {

        //接受post过来的数据
        //存入数据库
        //重定向
        Article::create($request->all());
        return redirect('/articles');
    }