Note: this list is generated by looking for the string for this theme hook, so it may include some references that are not actually using this theme hook.

backdrop_common_theme in core/includes/common.inc
Provides theme registration for themes across .inc files.
DatabaseSchema_mysql::getFieldTypeMap in core/includes/database/mysql/schema.inc
Returns a mapping of Backdrop schema field names to DB-native field types.
database_test_schema in core/modules/simpletest/tests/database_test.install
Implements hook_schema().
DateFieldBasic::createDateField in core/modules/date/tests/date_field.test
Creates a date field from an array of settings values.
DateFieldBasic::createMultiDateField in core/modules/date/tests/date_field.test
Creates a date field from an array of settings values.
DateFieldTestCase::testField in core/modules/date/tests/date_field.test
@todo.
DateTimezoneTestCase::testMultiUserTimezone in core/modules/date/tests/date_timezone.test
Validates timezone handling with a multi-value date field.
DateTimezoneTestCase::testTimezone in core/modules/date/tests/date_timezone.test
Creates one of each type of date field and check timezone handling in each.
DateUITestCase::testFieldUI in core/modules/date/tests/date.test
DateValidationTestCase::testValidation in core/modules/date/tests/date_validation.test
Test validation on each type of date widget.
DateViewsTestCase::setUp in core/modules/date/tests/date_views.test
Test setup actions.
DateViewsTestCase::testDateViewsFields in core/modules/date/tests/date_views.test
date_field_formatter_info in core/modules/date/date.field.inc
Implements hook_field_formatter_info().
date_field_info in core/modules/date/date.field.inc
Implements hook_field_info().
date_field_schema in core/modules/date/date.install
Implements hook_field_schema().
date_field_widget_info in core/modules/date/date.field.inc
Implements hook_field_widget_info().
date_formatter_process in core/modules/date/date.module
Helper function for creating formatted date arrays from a formatter.
date_form_field_ui_field_edit_form_alter in core/modules/date/date.module
Implements hook_form_FORM_ID_alter() for field_ui_field_edit_form().
date_granularity_names in core/includes/date.inc
Constructs an array of granularity options and their labels.
date_sql_handler::date_parts in core/modules/date/views/date_sql_handler.inc
An array of all date parts, optionally limited to an array of allowed parts.
date_tokens in core/modules/date/date.tokens.inc
Implements hook_tokens().
date_token_info_alter in core/modules/date/date.tokens.inc
Implements hook_token_info_alter().
date_views_argument_handler_simple::options_form in core/modules/date/views/date_views_argument_handler_simple.inc
Add a form element to select date_fields for this argument.
form_test_h5datetime in core/modules/simpletest/tests/form_test.module
Form constructor for #type html_date, html_time and html_datetime elements.
template_preprocess_datetime in core/includes/theme.inc
Preprocess variables for theme_datetime().
ThemeDatetime::testThemeDatetime in core/modules/simpletest/tests/theme.test
Test function theme_datetime().
views_date_sql_field in core/modules/views/includes/utility.inc
Helper function to create cross-database SQL dates.
_date_views_fields in core/modules/date/views/date_views_fields.inc
Identify all potential date/timestamp fields.