Forms symfony2表单中的日期时区警告

我在基于symfony2的应用程序中遇到奇怪的错误。在每一页上使用我得到的表格

E_WARNING: DateTimeZone::__construct(): Unknown or bad timezone (1024)

仅供参考，我正在调用

date_default_timezone_set("Europe/Warsaw");

在AppKernel:：init（）中。你知道如何摆脱这个警告吗？提前谢谢

编辑 这是我在NewRelic的堆栈跟踪

…or/symfony/symfony/src/Symfony/Component/Locale/Stub/StubIntlDateFormatter.php (542)
…or/symfony/symfony/src/Symfony/Component/Form/Extension/Core/Type/DateType.php (274)
…or/symfony/symfony/src/Symfony/Component/Form/Extension/Core/Type/DateType.php (88)
…/shared/vendor/symfony/symfony/src/Symfony/Component/Form/ResolvedFormType.php (167)
…/shared/vendor/symfony/symfony/src/Symfony/Component/Form/ResolvedFormType.php (164)   
…/shared/vendor/symfony/symfony/src/Symfony/Component/Form/ResolvedFormType.php (126)
…zy.pl/shared/vendor/symfony/symfony/src/Symfony/Component/Form/FormFactory.php (87)  
…zy.pl/shared/vendor/symfony/symfony/src/Symfony/Component/Form/FormBuilder.php (114)
…zy.pl/shared/vendor/symfony/symfony/src/Symfony/Component/Form/FormBuilder.php (342)
…zy.pl/shared/vendor/symfony/symfony/src/Symfony/Component/Form/FormBuilder.php (230)
…zy.pl/shared/vendor/symfony/symfony/src/Symfony/Component/Form/in Symfony\Component\Form\FormBuilder::getForm called at /var/www/tumamoczy.pl/shared/vendor/symfony/symfony/src/Symfony/Component/Form/FormFactory.php FormFactory.php (47)
…endor/friendsofsymfony/user-bundle/FOS/UserBundle/Form/Factory/FormFactory.php (33)
…endsofsymfony/user-bundle/FOS/UserBundle/Controller/RegistrationController.php (48)
in FOS\UserBundle\Controller\RegistrationController::registerAction called at ? (?)
…alled at /var/www/tumamoczy.pl/releases/20130602213844/app/bootstrap.php.cache (1003) 
…alled at /var/www/tumamoczy.pl/releases/20130602213844/app/bootstrap.php.cache (977)
…alled at /var/www/tumamoczy.pl/releases/20130602213844/app/bootstrap.php.cache (1103)
…alled at /var/www/tumamoczy.pl/releases/20130602213844/app/bootstrap.php.cache (413)
…el::handle called at /var/www/tumamoczy.pl/releases/20130602213844/web/app.php (21)

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看起来StubIntlDateFormatter.php中出现了警告，对吗？那么这是一个Symfony2问题吗？它甚至是可解的吗？

它是否会给您一个发生此错误的行号。我试着把你的代码放在同一个地方，我的日期时间也按预期进行了调整。我添加了一个来自NewRelic的堆栈跟踪，也许它可以帮助我；）您的php是否启用了扩展php_intl？