11 string references to 'DateTime'

Debug::export in drupal/core/vendor/doctrine/common/lib/Doctrine/Common/Util/Debug.php
Export
DebugTest::testExportDateTime in drupal/core/vendor/doctrine/common/tests/Doctrine/Tests/Common/Util/DebugTest.php
EqualToValidatorTest::provideInvalidComparisons in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Constraints/EqualToValidatorTest.php
GreaterThanOrEqualValidatorTest::provideInvalidComparisons in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Constraints/GreaterThanOrEqualValidatorTest.php
GreaterThanValidatorTest::provideInvalidComparisons in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Constraints/GreaterThanValidatorTest.php
HeaderBagTest::testGetDate in drupal/core/vendor/symfony/http-foundation/Symfony/Component/HttpFoundation/Tests/HeaderBagTest.php
IdenticalToValidatorTest::provideInvalidComparisons in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php
LessThanOrEqualValidatorTest::provideInvalidComparisons in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Constraints/LessThanOrEqualValidatorTest.php
LessThanValidatorTest::provideInvalidComparisons in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Constraints/LessThanValidatorTest.php
NotEqualToValidatorTest::provideInvalidComparisons in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Constraints/NotEqualToValidatorTest.php
NotIdenticalToValidatorTest::provideInvalidComparisons in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Constraints/NotIdenticalToValidatorTest.php