25 files declare their use of DrupalDateTime

CommentFormController.php in drupal/core/modules/comment/lib/Drupal/comment/CommentFormController.php
Definition of Drupal\comment\CommentFormController.
CommentPreviewTest.php in drupal/core/modules/comment/lib/Drupal/comment/Tests/CommentPreviewTest.php
Definition of Drupal\comment\Tests\CommentPreviewTest.
common.inc in drupal/core/includes/common.inc
Common functions that many Drupal modules will need to reference.
CustomBlockFormController.php in drupal/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php
Contains \Drupal\custom_block\CustomBlockFormController.
Date.php in drupal/core/lib/Drupal/Core/Datetime/Date.php
Contains \Drupal\Component\Datetime\Date.
Date.php in drupal/core/lib/Drupal/Core/TypedData/Type/Date.php
Contains \Drupal\Core\TypedData\Type\Date.
DateFormatFormBase.php in drupal/core/modules/system/lib/Drupal/system/Form/DateFormatFormBase.php
Contains \Drupal\system\Form\DateFormatFormBase.
DateHelper.php in drupal/core/modules/datetime/lib/Drupal/datetime/DateHelper.php
Contains \Drupal\datetime\DateHelper.
datetime.module in drupal/core/modules/datetime/datetime.module
Field hooks to implement a simple datetime field.
DatetimeDatelistWidget.php in drupal/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDatelistWidget.php
Contains \Drupal\datetime\Plugin\field\widget\DateTimeDatelistWidget.
DatetimeDefaultFormatter.php in drupal/core/modules/datetime/lib/Drupal/datetime/Plugin/field/formatter/DatetimeDefaultFormatter.php
Contains \Drupal\datetime\Plugin\field\formatter\DateTimeDefaultFormatter.
DatetimeDefaultWidget.php in drupal/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDefaultWidget.php
Contains \Drupal\datetime\Plugin\field\widget\DateTimeDefaultWidget.
DatetimeFieldTest.php in drupal/core/modules/datetime/lib/Drupal/datetime/Tests/DatetimeFieldTest.php
Contains \Drupal\datetime\Tests\DatetimeFieldTest.
DatetimePlainFormatter.php in drupal/core/modules/datetime/lib/Drupal/datetime/Plugin/field/formatter/DatetimePlainFormatter.php
Contains \Drupal\datetime\Plugin\field\formatter\DateTimePlainFormatter.
DrupalDateTimeTest.php in drupal/core/modules/system/lib/Drupal/system/Tests/Datetime/DrupalDateTimeTest.php
Definition of Drupal\system\Tests\Datetime\DateTimePlusTest.
form.inc in drupal/core/includes/form.inc
Functions for form and batch generation and processing.
form_test.module in drupal/core/modules/system/tests/modules/form_test/form_test.module
Helper module for the form API tests.
ForumBlockTest.php in drupal/core/modules/forum/lib/Drupal/forum/Tests/ForumBlockTest.php
Definition of Drupal\forum\Tests\ForumBlockTest.
LegacyTest.php in drupal/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/LegacyTest.php
Definition of Drupal\taxonomy\Tests\LegacyTest.
node.module in drupal/core/modules/node/node.module
The core module that allows content to be submitted to the site.
NodeFormController.php in drupal/core/modules/node/lib/Drupal/node/NodeFormController.php
Definition of Drupal\node\NodeFormController.
PrimitiveTypeConstraintValidator.php in drupal/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/PrimitiveTypeConstraintValidator.php
Contains \Drupal\Core\Validation\Plugin\Validation\Constraint\PrimitiveTypeConstraintValidator.
system.admin.inc in drupal/core/modules/system/system.admin.inc
Admin page callbacks for the system module.
TypedDataTest.php in drupal/core/modules/system/lib/Drupal/system/Tests/TypedData/TypedDataTest.php
Definition of Drupal\system\Tests\TypedData\TypedDataTest.
WebTestBase.php in drupal/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
Definition of Drupal\simpletest\WebTestBase.