How to avoid users entering invalid date in jui date picker in yii2

Hi, I am using Yii2 basic.

I have a table called members with fields MemberId, Name, etc. I have another table called memberchildrendata with fields ChildId, MemberId,etc. Also I have created the CRUD’s for same.

The relationship between two tables is one to many so the primary key of members table MemberId is foreign key in the memberchildrendata.

Now I am using dynamic form widget extension in yii2 form.
I have a field DateOfMarriage where I am using jui datepicker in yii2. This field is in memberchildrendata table.

Now I have enabled enableAjaxValidation to this field as shown

<td style="border: 1px solid black;">                                                                                                                          
<?= $form->field($modelsmemchildren, "[{$i}]DateOfMarriage",['enableAjaxValidation'=>true])->label(false)->widget(DatePicker::classname(), [
                                'dateFormat' => 'yyyy-MM-dd',
				                'options' => ['class' => 'form-control picker1']])                                                          

In my Members controller I have used this code,

if (Yii::$app->request->isAjax && $model->load(Yii::$app->request->post())) {
            Yii::$app->response->format = Response::FORMAT_JSON;
            return ActiveForm::validate($model);

In my Memberschildrendata model, I have a function which validate the DateOfBirth field as

public function validatedate($attribute, $params, $validator)
        $this->addError($attribute,'Date is not good');

Now when the user tries to enter the date as 0000-00-00 immediately error should be displayed on the form as Date is not good. In dynamic form widget it is not working. It is accepting the date. How to solve this

I do not see any call to the function validatedate. Do you have created a rule for DateOfMarriage ? Something like

    public function rules()
        return [
            ['DateOfMarriage', 'validatedate'],
            // . . .  other rules . . .