At first I created migrations for table called 'board-directors' and in this table their column his name 'start_date' it's date after I generator with Yii2 I/O Generator their no DatePicker in form
this code in board-directors->_form
?= $form->field($model, 'start_date')->widget(\kartik\datecontrol\DateControl::classname(), [
'type' => \kartik\datecontrol\DateControl::FORMAT_DATETIME,
'saveFormat' => 'php:Y-m-d H:i:s',
'ajaxConversion' => true,
'options' => [
'pluginOptions' => [
'placeholder' => Yii::t('app', 'Choose Start Date'),
'autoclose' => true,
]
],
]); ?>