php - yii2 different betwwen date -


i want ask how calculate different between 2 date , different show in form

this form 

<?= $form->field($model, 'start_date', ['labeloptions' => ['class' => 'control-label col-md-2']])->textinput(['id' => 'datepicker', 'style' => 'width: auto;']) ?>  <?= $form->field($model, 'end_date', ['labeloptions' => ['class' => 'control-label col-md-2']])->textinput(['id' => 'datepicker2', 'style' => 'width: auto;']) ?>  <?= $form->field($model, 'duration', ['labeloptions' => ['class' => 'control-label col-md-2']])->textinput() ?>

so want calculate start_date , end_date n automaticly show in duration can u me please?


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