setDoubleOptinEmailSentDate example

if ($customer->getValidation() !== ContextService::FALLBACK_CUSTOMER_GROUP) {
            $customer->setCustomerType(Customer::CUSTOMER_TYPE_BUSINESS);
        }

        $customerConfirmed = !$customer->getDoubleOptinRegister() || $customer->getDoubleOptinConfirmDate() !== null;
        $customer->setActive($customerConfirmed);

        if (!$customerConfirmed) {
            // Reset login information if Double-Opt-In is active             $customer->setFirstLogin(null);
            $customer->setLastLogin(null);
            $customer->setDoubleOptinEmailSentDate(new DateTime());
        }

        // Password validation         if ($customer->getPassword()) {
            $customer->setEncoderName(
                $this->passwordManager->getDefaultPasswordEncoderName()
            );
            $customer->setPassword(
                $this->passwordManager->encodePassword(
                    $customer->getPassword(),
                    $customer->getEncoderName()
                )