diff --git a/src/Plugin/Field/FieldFormatter/DateRangeFormatterRangeFormatter.php b/src/Plugin/Field/FieldFormatter/DateRangeFormatterRangeFormatter.php
index 3d995e7..619cf54 100644
--- a/src/Plugin/Field/FieldFormatter/DateRangeFormatterRangeFormatter.php
+++ b/src/Plugin/Field/FieldFormatter/DateRangeFormatterRangeFormatter.php
@@ -47,7 +47,10 @@ class DateRangeFormatterRangeFormatter extends DateTimeCustomFormatter {
     $elements = [];
 
     foreach ($items as $delta => $item) {
-      if (!empty($item->start_date) && !empty($item->end_date)) {
+      if (!empty($item->start_date)) {
+        if (empty($item->end_date)) {
+          $item->end_date = clone($item->start_date);
+        }
         /** @var \Drupal\Core\Datetime\DrupalDateTime $start_date */
         $start_date = $item->start_date->getTimestamp();
         /** @var \Drupal\Core\Datetime\DrupalDateTime $end_date */