SaleItems = And a table mysql database.
<?php
<?= GridView::widget([
'dataProvider' => $dataProvider,
'filterModel' => $searchModel,
'formatter' => ['class' => 'yii\i18n\Formatter','nullDisplay' => ''],
'columns' => [
['class' => 'yii\grid\SerialColumn'],
**[
'attribute' => 'Data',
'content' => function(SaleItems $model, $key, $index, $column) {
return date('d/m/Y', strtotime($model->sale->date));
},
'header' => 'DATA'
],**
]); ?>
</div>