diff --git a/core/modules/datetime/src/Plugin/Field/FieldType/DateRangeFieldItemList.php b/core/modules/datetime/src/Plugin/Field/FieldType/DateRangeFieldItemList.php
index 2fedb5a..fd4904b 100644
--- a/core/modules/datetime/src/Plugin/Field/FieldType/DateRangeFieldItemList.php
+++ b/core/modules/datetime/src/Plugin/Field/FieldType/DateRangeFieldItemList.php
@@ -95,7 +95,7 @@ public static function processDefaultValue($default_value, FieldableEntityInterf
       // A default value should be in the format and timezone used for date
       // storage.
       $date = new DrupalDateTime($default_value[0]['default_date'], DATETIME_STORAGE_TIMEZONE);
-      $storage_format = $definition->getSetting('daterange_type') == DateRangeItem::DATERANGE_TYPE_DATE ? DATERANGE_DATE_STORAGE_FORMAT : DATERANGE_DATETIME_STORAGE_FORMAT;
+      $storage_format = $definition->getSetting('daterange_type') == DateRangeItem::DATERANGE_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