Add timestamps created_at and updated_at on yii2 mongodb

Mongo.php

    /**
     * Add timestamps on create and update records
     *
     * @return array
     */
    public function behaviors()
    {
        return [
            [
                'class' => TimestampBehavior::class,
                'createdAtAttribute' => 'created_at',
                'updatedAtAttribute' => 'updated_at',
                'value' => new \MongoDB\BSON\UTCDateTime(),
            ],
        ];
    }