Mai jos e codul pentru orice tip de selector de data/luna/an bazat pe ActiveForm si Kartik DateControl.
Tot ce trebuie facut e sa setezi variabila $dt.
Sigur ca se mai pot face si alte setari – de exemplu pentru eticheta – de modificat indexul ‘lb’ din $formatVars.

<?php
        $dt = 'years'; //one of the 3 indexes below
        $formatVars = [
          'days'   => ['f' => 'Y-m-d', 'df' => '', 'ph' => Yii::t('app', 'select date...'), 'lb' => Yii::t('app', 'On Date')],
          'months' => ['f' => 'M Y', 'df' => 'php:M Y', 'ph' => Yii::t('app', 'select month...'), 'lb' => Yii::t('app', 'For Month')],
          'years'  => ['f' => 'Y', 'df' => 'php:Y', 'ph' => Yii::t('app', 'select year...'), 'lb' => Yii::t('app', 'For Year')],
        ];
        $model->date = date($formatVars[$dt]['f']); // initial value -only for days- or comment to show only the placeholder
        echo $form->field($model, 'date', ['template' => '{label}<div class="col-sm-4 prerequisite backgroundOperations">{input}</div>'])
          ->widget(DateControl::classname(), [
            'type'          => 'date',
            'displayFormat' => $formatVars[$dt]['df'],
            'widgetOptions' => [
              'type'          => 3, //layout type for DatePicker
              'options'       => ['placeholder' => $formatVars[$dt]['ph']],
              'pluginOptions' => [ //DatePicker settings
                'todayHighlight' => TRUE,
                'minViewMode'    => $dt,
              ],
            ],
          ])->label($formatVars[$dt]['lb']);
        ?>