can't solve 'date' validation with 'max', 'min' properties Yii2 - yii2

Question

I can't understand - function returning string (verified by var_dump()):
['userBirthDate', 'date', 'format' => 'yyyy-MM-dd',
'max' => function() {
$date = new DateTime();
date_sub($date, date_interval_create_from_date_string('12 years'));
$maxDate = date_format($date, 'Y-m-d');
return $maxDate;
},
'min' => function() {
$date = new DateTime();
date_sub($date, date_interval_create_from_date_string('100 years'));
$minDate = date_format($date, 'Y-m-d');
return $minDate;
}
],
but I have the mistake:
"Object of class Closure could not be converted to string".

Answer 1

The validators max and min can only accept a number, not an anonymous function, that's why you are getting the error.
Try this code, which creates a new validator called validateUserBirthDate, as well as using the existing date validator.
[
['userBirthDate'],
'validateUserBirthDate'
],
[
['userBirthDate'],
'date', 'format' => 'format' => 'yyyy-MM-dd'
]
then in your model add a custom validator;
public function validateUserBirthDate($attribute, $params) {
$date = new \DateTime();
date_sub($date, date_interval_create_from_date_string('12 years'));
$minAgeDate = date_format($date, 'Y-m-d');
date_sub($date, date_interval_create_from_date_string('100 years'));
$maxAgeDate = date_format($date, 'Y-m-d');
if ($this->$attribute > $minAgeDate) {
$this->addError($attribute, 'Date is too small.');
} elseif ($this->$attribute < $maxAgeDate) {
$this->addError($attribute, 'Date is to big.');
}}