36 files declare their use of DateFormatterInterface in Drupal 9

AggregatorController.php in core/modules/aggregator/src/Controller/AggregatorController.php

BreakLockLink.php in core/lib/Drupal/Core/TempStore/Element/BreakLockLink.php

CommentAdminOverview.php in core/modules/comment/src/Form/CommentAdminOverview.php

ContentTranslationHandler.php in core/modules/content_translation/src/ContentTranslationHandler.php

CronForm.php in core/modules/system/src/Form/CronForm.php

Date.php in core/modules/views/src/Plugin/views/argument/Date.php

Date.php in core/modules/views/src/Plugin/views/field/Date.php

Date.php in core/modules/datetime/src/Plugin/views/filter/Date.php

Date.php in core/modules/datetime/src/Plugin/views/argument/Date.php

DateFormatDeleteForm.php in core/modules/system/src/Form/DateFormatDeleteForm.php

DateFormatFormBase.php in core/modules/system/src/Form/DateFormatFormBase.php

DateFormatListBuilder.php in core/modules/system/src/DateFormatListBuilder.php

DateTimeFormatterBase.php in core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeFormatterBase.php

DbLogController.php in core/modules/dblog/src/Controller/DbLogController.php

DefaultProcessor.php in core/modules/aggregator/src/Plugin/aggregator/processor/DefaultProcessor.php

FileSystemForm.php in core/modules/system/src/Form/FileSystemForm.php

IncrementalForm.php in core/modules/migrate_drupal_ui/src/Form/IncrementalForm.php

MediaListBuilder.php in core/modules/media/src/MediaListBuilder.php

MessageForm.php in core/modules/contact/src/MessageForm.php

ModeratedNodeListBuilder.php in core/modules/content_moderation/src/ModeratedNodeListBuilder.php

NodeController.php in core/modules/node/src/Controller/NodeController.php

NodeForm.php in core/modules/node/src/NodeForm.php

NodeListBuilder.php in core/modules/node/src/NodeListBuilder.php

NodeRevisionDeleteForm.php in core/modules/node/src/Form/NodeRevisionDeleteForm.php

NodeRevisionRevertForm.php in core/modules/node/src/Form/NodeRevisionRevertForm.php

NodeRevisionRevertTranslationForm.php in core/modules/node/src/Form/NodeRevisionRevertTranslationForm.php

PerformanceForm.php in core/modules/system/src/Form/PerformanceForm.php

Time.php in core/modules/views/src/Plugin/views/cache/Time.php

TimeInterval.php in core/modules/views/src/Plugin/views/field/TimeInterval.php

TimestampAgoFormatter.php in core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampAgoFormatter.php

TimestampFormatter.php in core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php

TrackerController.php in core/modules/tracker/src/Controller/TrackerController.php

TwigExtension.php in core/lib/Drupal/Core/Template/TwigExtension.php

UserController.php in core/modules/user/src/Controller/UserController.php

UserListBuilder.php in core/modules/user/src/UserListBuilder.php

ViewEditForm.php in core/modules/views_ui/src/ViewEditForm.php