Yii2: how to use custom validation function for activeform?

Question

In my form\'s model, I have a custom validation function for a field defined in this way

class SignupForm extends Model
{
    public function rules()
    {
          


        

Answer 1

Are you sure the first parameter of addError shouldn't be like this

$this->addError(**'attribute'**, Yii::t('user', 'You entered an invalid date format.'));