FRONTEND_MVC/modules/control/views/layouts/navbar.php

<?php

use yii\helpers\Html;

?>
<!-- Navbar -->
<nav class="main-header navbar navbar-expand navbar-white navbar-light">
    <!-- Left navbar links -->
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" data-widget="pushmenu" href="#" role="button"><i class="fas fa-bars"></i></a>
        </li>
        <li class="nav-item d-none d-sm-inline-block">
            <a href="<?=\yii\helpers\Url::home()?>" class="nav-link">amic.ru</a>
        </li>
    </ul>

    <!-- SEARCH FORM -->
    <form class="form-inline ml-3">
        <div class="input-group input-group-sm">
            <input class="form-control form-control-navbar" type="search" placeholder="Search" aria-label="Search" name="CommentsSearch[message]">
            <div class="input-group-append">
                <button class="btn btn-navbar" type="submit">
                    <i class="fas fa-search"></i>
                </button>
            </div>
        </div>
    </form>
    <form class="form-inline ml-3">
	<div class="input-group input-group-sm">
		<div class="input-group-prepend">
			<span class="input-group-text" id="basic-addon1">  <i class="fa fa-calendar"></i></span>
		</div>
		<input type="text" id="dt_list" class="col-auto" placeholder="Дата" aria-label="Дата" aria-describedby="basic-addon1" value="" name="CommentsSearch[created_at]">
		<div class="input-group-append">
			<button class="btn btn-outline-secondary" type="submit" id="go"><i class="fas fa-sync"></i></button>
		</div>
	</div>
    </form>
  <script>
<?
if(	$get = Yii::$app->session->get('dt-newslistadm') ){
	$get=strtotime($get);
}else{
	$get = time();
}
$setdate = (isset($_GET['dt']))?strtotime($_GET['dt']):$get;
?>
  $( function() {
    $( "#dt_list" ).datepicker();
    $( "#dt_list" ).datepicker("option",{ dateFormat: 'yy-mm-dd'});
	$( "#dt_list" ).datepicker( "setDate", "<?=date("Y-m-d", $setdate)?>" );

  } );
  </script>
    <!-- Right navbar links -->
    <ul class="navbar-nav ml-auto">

        <li class="nav-item">
            <?= Html::a('<i class="fas fa-sign-out-alt"></i>', ['/site/logout'], ['data-method' => 'post', 'class' => 'nav-link']) ?>
        </li>
        <li class="nav-item">
            <a class="nav-link" data-widget="fullscreen" href="#" role="button">
                <i class="fas fa-expand-arrows-alt"></i>
            </a>
        </li>

    </ul>
</nav>
<!-- /.navbar -->