core/modules/datetime/datetime.module              |   42 --------------------
 .../Plugin/field/widget/DatetimeDatelistWidget.php |   19 ---------
 .../Plugin/field/widget/DatetimeDefaultWidget.php  |   19 ---------
 .../Drupal/datetime/Tests/DatetimeFieldTest.php    |    2 -
 4 files changed, 82 deletions(-)

diff --git a/core/modules/datetime/datetime.module b/core/modules/datetime/datetime.module
index b545c36..e6f8985 100644
--- a/core/modules/datetime/datetime.module
+++ b/core/modules/datetime/datetime.module
@@ -249,48 +249,6 @@ function datetime_field_load($entity_type, $entities, $field, $instances, $langc
 }
 
 /**
- * Sets a default value for an empty date field.
- *
- * Callback for $instance['default_value_function'], as implemented by
- * Drupal\datetime\Plugin\field\widget\DateTimeDatepicker.
- *
- * @param $entity_type
- *
- * @param $entity
- *
- * @param array $field
- *
- * @param array $instance
- *
- * @param $langcode
- *
- *
- * @return array
- *
- */
-function datetime_default_value($entity, $field, $instance, $langcode) {
-
-  $value = '';
-  $date = '';
-  if ($instance['settings']['default_value'] == 'now') {
-    // A default value should be in the format and timezone used for date
-    // storage.
-    $date = new DrupalDateTime('now', DATETIME_STORAGE_TIMEZONE);
-    $storage_format = $field['settings']['datetime_type'] == 'date' ? DATETIME_DATE_STORAGE_FORMAT: DATETIME_DATETIME_STORAGE_FORMAT;
-    $value = $date->format($storage_format);
-  }
-
-  // We only provide a default value for the first item, as do all fields.
-  // Otherwise, there is no way to clear out unwanted values on multiple value
-  // fields.
-  $item = array();
-  $item[0]['value'] = $value;
-  $item[0]['date'] = $date;
-
-  return $item;
-}
-
-/**
  * Sets a consistent time on a date without time.
  *
  * The default time for a date without time can be anything, so long as it is
diff --git a/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDatelistWidget.php b/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDatelistWidget.php
index f0d60fe..78ed2dd 100644
--- a/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDatelistWidget.php
+++ b/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDatelistWidget.php
@@ -36,25 +36,6 @@
 class DateTimeDatelistWidget extends WidgetBase {
 
   /**
-   * {@inheritdoc}
-   */
-  public function __construct($plugin_id, array $plugin_definition, FieldInstance $instance, array $settings) {
-    // Identify the function used to set the default value.
-    $instance['default_value_function'] = $this->defaultValueFunction();
-    parent::__construct($plugin_id, $plugin_definition, $instance, $settings);
-  }
-
-  /**
-   * Returns the callback used to set a date default value.
-   *
-   * @return string
-   *   The name of the callback to use when setting a default date value.
-   */
-  public function defaultValueFunction() {
-    return 'datetime_default_value';
-  }
-
-  /**
    * Implements \Drupal\field\Plugin\Type\Widget\WidgetInterface::formElement().
    */
   public function formElement(array $items, $delta, array $element, $langcode, array &$form, array &$form_state) {
diff --git a/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDefaultWidget.php b/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDefaultWidget.php
index f0c45c0..ffffb66 100644
--- a/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDefaultWidget.php
+++ b/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDefaultWidget.php
@@ -30,25 +30,6 @@
 class DateTimeDefaultWidget extends WidgetBase {
 
   /**
-   * {@inheritdoc}
-   */
-  public function __construct($plugin_id, array $plugin_definition, FieldInstance $instance, array $settings) {
-    // Identify the function used to set the default value.
-    $instance['default_value_function'] = $this->defaultValueFunction();
-    parent::__construct($plugin_id, $plugin_definition, $instance, $settings);
-  }
-
-  /**
-   * Return the callback used to set a date default value.
-   *
-   * @return string
-   *   The name of the callback to use when setting a default date value.
-   */
-  public function defaultValueFunction() {
-    return 'datetime_default_value';
-  }
-
-  /**
    * Implements \Drupal\field\Plugin\Type\Widget\WidgetInterface::formElement().
    *
    */
diff --git a/core/modules/datetime/lib/Drupal/datetime/Tests/DatetimeFieldTest.php b/core/modules/datetime/lib/Drupal/datetime/Tests/DatetimeFieldTest.php
index dd7712e..a801296 100644
--- a/core/modules/datetime/lib/Drupal/datetime/Tests/DatetimeFieldTest.php
+++ b/core/modules/datetime/lib/Drupal/datetime/Tests/DatetimeFieldTest.php
@@ -287,7 +287,6 @@ function testDefaultValue() {
 
     // Set the default value to 'now'.
     $this->instance['settings']['default_value'] = 'now';
-    $this->instance['default_value_function'] = 'datetime_default_value';
     field_update_instance($this->instance);
 
     // Display creation form.
@@ -305,7 +304,6 @@ function testDefaultValue() {
 
     // Set the default value to 'blank'.
     $this->instance['settings']['default_value'] = 'blank';
-    $this->instance['default_value_function'] = 'datetime_default_value';
     field_update_instance($this->instance);
 
     // Display creation form.