creation time is invalid when update in yii2 - yii2

Question

when I want to update form in yii2
It tells me this error
creation time is invalid -- update time is invalid
What do you think is it?
public function beforeSave($insert)
{
$date = new \DateTime();
$date->setTimestamp(time());
$date->setTimezone(new \DateTimezone('Istanbul'));
$this->update_time = $date->format('Y-m-d H:i:s');
if($this->isNewRecord)
$this->creation_time = $date->format('Y-m-d H:i:s');
return parent::beforeSave($insert);
}
My problem has been resolved
change date to safe in rules
[['creation_time', 'update_time'], 'safe'],

Answer 1

Your code is correct "Nader" but some time assigning the value not work so just remove the value or use this
public function behaviors()
{
return [
[
'class' => TimestampBehavior::className(),
'createdAtAttribute' => 'create_time',
'updatedAtAttribute' => 'update_time',
//'value' => new Expression('NOW()'),
],
];
}
Just comment the value,
it will work.
For more detail https://www.yiiframework.com/doc/api/2.0/yii-behaviors-timestampbehavior

Answer 2

Just could just use the available TimestampBehavior behavior
use yii\behaviors\TimestampBehavior;
use yii\db\Expression;
use yii\db\ActiveRecord;
class Mymodel extends ActiveRecord{
public function behaviors() {
return [
[
'class' => TimestampBehavior::className(),
'createdAtAttribute' => 'creation_time',
'updatedAtAttribute' => 'update_time',
'attributes' => [
ActiveRecord::EVENT_BEFORE_INSERT => 'creation_time',
ActiveRecord::EVENT_BEFORE_UPDATE => 'update_time',
],
'value' => new Expression('NOW()')
]
];
}
}
Remove any validation rules from your model you may have for this two attributes
creation_time and update_time