"Date" Field Validation Error

i have two question.

1. I put data in both field "Department Name" and "Starting Date" but validation message occur that "The depjdate field is required." Snapshot as following https://prnt.sc/jqhkqs
2. as you showing in picture the validation show message "The depjdate field is required." but i want to show the message "The Starting Date field is required." addDepartment.blade.php

<form method="POST" action="{{ route('department.store') }}">
  @csrf

<div class="card-body row">

   <div class="col-lg-6 p-t-20"> 
    <div class = "mdl-textfield mdl-js-textfield mdl-textfield--floating-label txt-full-width">
          <input class = "mdl-textfield__input{{ $errors->has('name') ? ' is-invalid' : '' }}" 
                   name="departmentname" type = "text" id = "txtDepName" value="{{ 
                    old('departmentname') }}">
         @if ($errors->has('departmentname'))
                                    <span class="invalid-feedback">
                                        <strong>{{ $errors->first('departmentname') }}</strong>
                                     </span>
                                   @endif
    <label class = "mdl-textfield__label">Department Name</label>
         </div>
      </div>
                                     

                                        


                                     
<div class="col-lg-6 p-t-20"> 
       <div class = "mdl-textfield mdl-js-textfield mdl-textfield--floating-label txt-full-width">
              <input class = "mdl-textfield__input{{ $errors->has('depstartdate') ? ' is-invalid' : '' }}" name="depstartdate" type = "text" id = "date" value="{{ old('depstartdate') }}" >
                                               
@if ($errors->has('depstartdate'))
                                    <span class="invalid-feedback">
                                        <strong>{{ $errors->first('depstartdate') }}</strong>
                                    </span>
                                @endif


          <label class = "mdl-textfield__label" >Department Start Date</label>
           </div>
      </div>



        @if ($errors->any())
   <div class="col-md-12 alert alert-danger">
       <ul>
           @foreach ($errors->all() as $error)
               <li>{{ $error }}</li>
           @endforeach
       </ul>
   </div>
 @endif
                                       
                                        
   <div class="col-lg-12 p-t-20 text-center"> 
            <button type="submit" class="mdl-button mdl-js-button mdl-button--raised mdl-js-ripple-effect m-b-10 m-r-20 btn-pink">Submit</button>
            <button type="reset" class="mdl-button mdl-js-button mdl-button--raised mdl-js-ripple-effect m-b-10 btn-default">Reset</button>
      </div>
 </form>

The DepartmentController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Department;

class DepartmentController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $depart= Department::all();
        return view('admin.allDepartment', compact('depart'));

    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        return view('admin.adddepartment');
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        $this->validate($request, [
        'departmentname' => 'required',
        'depjdate' => 'required',
        ]);

        $s = new Department();
        $s->departmentname = $request->departmentname;
        $s->depstartdate = $request->depstartdate;
       
        $s->save();
        return redirect("department");
    }


}

And The table code as following:

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class AddDepartmentToTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
         Schema::create('department', function (Blueprint $table) {

            $table->increments('depid');
            $table->string('departmentname')->unique();
            $table->date('depstartdate');
            $table->rememberToken();
            $table->timestamps();
            });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('department', function (Blueprint $table) {
    
        });
    }
}