getBirthday example

'email' => $customer->getEmail(),
            'active' => $customer->getActive(),
            'accountmode' => $customer->getAccountMode(),
            'firstlogin' => $this->formatDate($customer->getFirstLogin()),
            'newsletter' => $customer->isNewsletter(),
            'shop_id' => $customer->getShopId(),
            'default_billing_address_id' => $customer->getDefaultBillingAddressId(),
            'title' => $customer->getTitle(),
            'salutation' => $customer->getSalutation(),
            'firstname' => $customer->getFirstname(),
            'lastname' => $customer->getLastname(),
            'birthday' => $this->formatDate($customer->getBirthday()),
            'customernumber' => $customer->getNumber(),
            'customer_group_id' => $customer->getCustomerGroup() ? $customer->getCustomerGroup()->getId() : null,
            'customer_group_name' => $customer->getCustomerGroup() ? $customer->getCustomerGroup()->getName() : '',
            'payment_id' => $customer->getPaymentId(),
            'company' => $customer->getBillingAddress() ? $customer->getBillingAddress()->getCompany() : '',
            'department' => $customer->getBillingAddress() ? $customer->getBillingAddress()->getDepartment() : '',
            'street' => $customer->getBillingAddress() ? $customer->getBillingAddress()->getStreet() : '',
            'zipcode' => $customer->getBillingAddress() ? $customer->getBillingAddress()->getZipcode() : '',
            'city' => $customer->getBillingAddress() ? $customer->getBillingAddress()->getCity() : '',
            'phone' => $customer->getBillingAddress() ? $customer->getBillingAddress()->getPhone() : '',
            'additional_address_line1' => $customer->getBillingAddress() ? $customer->getBillingAddress()->getAdditionalAddressLine1() : '',
            

'groupId' => $context->getCurrentCustomerGroup()->getId(),
            'requestedGroupId' => $data->get('requestedGroupId', null),
            'defaultPaymentMethodId' => $context->getPaymentMethod()->getId(),
            'salutationId' => $data->get('salutationId'),
            'firstName' => $data->get('firstName'),
            'lastName' => $data->get('lastName'),
            'email' => $data->get('email'),
            'title' => $data->get('title'),
            'affiliateCode' => $data->get(OrderService::AFFILIATE_CODE_KEY),
            'campaignCode' => $data->get(OrderService::CAMPAIGN_CODE_KEY),
            'active' => true,
            'birthday' => $this->getBirthday($data),
            'guest' => $isGuest,
            'firstLogin' => new \DateTimeImmutable(),
            'addresses' => [],
        ];

        if (!$isGuest) {
            $customer['password'] = $data->get('password');
        }

        $event = new DataMappingEvent($data, $customer, $context->getContext());
        $this->eventDispatcher->dispatch($event, CustomerEvents::MAPPING_REGISTER_CUSTOMER);

        

return false;
        }

        if (!$customer = $scope->getSalesChannelContext()->getCustomer()) {
            return RuleComparison::isNegativeOperator($this->operator);
        }

        if (!$this->age && $this->operator !== self::OPERATOR_EMPTY) {
            throw new UnsupportedValueException(\gettype($this->age), self::class);
        }

        if (!$birthday = $customer->getBirthday()) {
            return RuleComparison::isNegativeOperator($this->operator);
        }

        $birthday = (new \DateTime())->setTimestamp($birthday->getTimestamp());
        $now = new \DateTime();

        $age = $now->diff($birthday)->y;

        return RuleComparison::numeric($age, $this->age, $this->operator);
    }

    

if (!$scope instanceof CheckoutRuleScope) {
            return false;
        }

        if ($this->birthday === null && $this->operator !== self::OPERATOR_EMPTY) {
            throw new UnsupportedValueException(\gettype($this->birthday), self::class);
        }

        if (!$customer = $scope->getSalesChannelContext()->getCustomer()) {
            return RuleComparison::isNegativeOperator($this->operator);
        }
        $customerBirthday = $customer->getBirthday();

        if ($customerBirthday instanceof \DateTimeImmutable) {
            $customerBirthday = \DateTime::createFromImmutable($customerBirthday);
        }

        if ($this->operator === self::OPERATOR_EMPTY) {
            return $customerBirthday === null;
        }

        if (
            !$customerBirthday instanceof \DateTime
            

$this->dispatchValidationEvent($validation, $data, $context->getContext());

        $this->validator->validate($data->all(), $validation);

        $customerData = $data->only('firstName', 'lastName', 'salutationId', 'title', 'company', 'accountType');

        if ($vatIds) {
            $customerData['vatIds'] = $data->get('vatIds');
        }

        if ($birthday = $this->getBirthday($data)) {
            $customerData['birthday'] = $birthday;
        }

        if ($data->get('customFields') instanceof RequestDataBag) {
            $customerData['customFields'] = $this->storeApiCustomFieldMapper->map(
                CustomerDefinition::ENTITY_NAME,
                $data->get('customFields')
            );
        }

        $mappingEvent = new DataMappingEvent($data, $customerData, $context->getContext());
        

$customer->setTitle($data['__customer_title']);
        $customer->setSalutation($data['__customer_salutation']);
        $customer->setFirstname($data['__customer_firstname']);
        $customer->setLastname($data['__customer_lastname']);
        $customer->setNumber($data['__customer_customernumber']);
        $customer->setNewsletter((bool) $data['__active_campaign']);

        if ($data['__customer_birthday']) {
            $customer->setBirthday(new DateTime($data['__customer_birthday']));
        }

        if ($customer->getBirthday()) {
            $customer->setAge($customer->getBirthday()->diff(new DateTime())->y);
        }

        if (!empty($data['__customer_lockeduntil'])) {
            $customer->setLockedUntil(new DateTime($data['__customer_lockeduntil']));
        }
        if (!empty($data['__customer_firstlogin'])) {
            $customer->setFirstLogin(new DateTime($data['__customer_firstlogin']));
        }
        if (!empty($data['__customer_lastlogin'])) {
            $customer->setLastLogin(new DateTime($data['__customer_lastlogin']));
        }