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diff --git a/web/core/modules/datetime/src/Plugin/Field/FieldType/DateTimeFieldItemList.php b/web/core/modules/datetime/src/Plugin/Field/FieldType/DateTimeFieldItemList.php
new file mode 100644
index 000000000..45a781b4b
--- /dev/null
+++ b/web/core/modules/datetime/src/Plugin/Field/FieldType/DateTimeFieldItemList.php
@@ -0,0 +1,121 @@
+<?php
+
+namespace Drupal\datetime\Plugin\Field\FieldType;
+
+use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\Core\Entity\FieldableEntityInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemList;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Represents a configurable entity datetime field.
+ */
+class DateTimeFieldItemList extends FieldItemList {
+
+  /**
+   * Defines the default value as now.
+   */
+  const DEFAULT_VALUE_NOW = 'now';
+
+  /**
+   * Defines the default value as relative.
+   */
+  const DEFAULT_VALUE_CUSTOM = 'relative';
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultValuesForm(array &$form, FormStateInterface $form_state) {
+    if (empty($this->getFieldDefinition()->getDefaultValueCallback())) {
+      $default_value = $this->getFieldDefinition()->getDefaultValueLiteral();
+
+      $element = [
+        '#parents' => ['default_value_input'],
+        'default_date_type' => [
+          '#type' => 'select',
+          '#title' => t('Default date'),
+          '#description' => t('Set a default value for this date.'),
+          '#default_value' => isset($default_value[0]['default_date_type']) ? $default_value[0]['default_date_type'] : '',
+          '#options' => [
+            static::DEFAULT_VALUE_NOW => t('Current date'),
+            static::DEFAULT_VALUE_CUSTOM => t('Relative date'),
+          ],
+          '#empty_value' => '',
+        ],
+        'default_date' => [
+          '#type' => 'textfield',
+          '#title' => t('Relative default value'),
+          '#description' => t("Describe a time by reference to the current day, like '+90 days' (90 days from the day the field is created) or '+1 Saturday' (the next Saturday). See <a href=\"http://php.net/manual/function.strtotime.php\">strtotime</a> for more details."),
+          '#default_value' => (isset($default_value[0]['default_date_type']) && $default_value[0]['default_date_type'] == static::DEFAULT_VALUE_CUSTOM) ? $default_value[0]['default_date'] : '',
+          '#states' => [
+            'visible' => [
+              ':input[id="edit-default-value-input-default-date-type"]' => ['value' => static::DEFAULT_VALUE_CUSTOM],
+            ]
+          ]
+        ]
+      ];
+
+      return $element;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultValuesFormValidate(array $element, array &$form, FormStateInterface $form_state) {
+    if ($form_state->getValue(['default_value_input', 'default_date_type']) == static::DEFAULT_VALUE_CUSTOM) {
+      $is_strtotime = @strtotime($form_state->getValue(['default_value_input', 'default_date']));
+      if (!$is_strtotime) {
+        $form_state->setErrorByName('default_value_input][default_date', t('The relative date value entered is invalid.'));
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultValuesFormSubmit(array $element, array &$form, FormStateInterface $form_state) {
+    if ($form_state->getValue(['default_value_input', 'default_date_type'])) {
+      if ($form_state->getValue(['default_value_input', 'default_date_type']) == static::DEFAULT_VALUE_NOW) {
+        $form_state->setValueForElement($element['default_date'], static::DEFAULT_VALUE_NOW);
+      }
+      return [$form_state->getValue('default_value_input')];
+    }
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function processDefaultValue($default_value, FieldableEntityInterface $entity, FieldDefinitionInterface $definition) {
+    $default_value = parent::processDefaultValue($default_value, $entity, $definition);
+
+    if (isset($default_value[0]['default_date_type'])) {
+      if ($definition->getSetting('datetime_type') === DateTimeItem::DATETIME_TYPE_DATE) {
+        // A default date only value should be in the format used for date
+        // storage but in the user's local timezone.
+        $date = new DrupalDateTime($default_value[0]['default_date'], drupal_get_user_timezone());
+        $format = DATETIME_DATE_STORAGE_FORMAT;
+      }
+      else {
+        // A default date+time value should be in the format and timezone used
+        // for date storage.
+        $date = new DrupalDateTime($default_value[0]['default_date'], DATETIME_STORAGE_TIMEZONE);
+        $format = DATETIME_DATETIME_STORAGE_FORMAT;
+      }
+      $value = $date->format($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.
+      $default_value = [
+        [
+          'value' => $value,
+          'date' => $date,
+        ]
+      ];
+    }
+    return $default_value;
+  }
+
+}