diff --git a/src/Plugin/migrate/process/CalculateEndtime.php b/src/Plugin/migrate/process/CalculateEndtime.php
new file mode 100644
index 0000000000000000000000000000000000000000..5aa7948e72c44458a4a25f843cf22b542700d356
--- /dev/null
+++ b/src/Plugin/migrate/process/CalculateEndtime.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Drupal\druplan_demo\Plugin\migrate\process;
+
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+
+/**
+ * Calculate end time based on start and duration.
+ *
+ * @MigrateProcessPlugin(
+ *   id = "endtime_value",
+ *   handle_multiples = TRUE
+ * )
+ */
+class CalculateEndtime extends ProcessPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    if (empty($value)) {
+      $start_time = $row->getSourceProperty('startuur');
+      $duration = $row->getSourceProperty('duurtijd');
+      $hours = '1';
+      $minutes = '0';
+      if(!empty($duration)) {
+        list($hours, $minutes) = explode(':', $duration);
+      }
+      if (!empty($start_time)) {
+        $formatted_start = str_replace('u', ':', $start_time);
+        $start_datetime = \DateTime::createFromFormat('H:i', $formatted_start);
+        if ($start_datetime) {
+          $start_datetime->modify("+{$hours} hours +{$minutes} minutes");
+          return $start_datetime->format('H:i');
+        }
+      }
+      return '22:45';
+    }
+    return str_replace('u', ':',$value);
+  }
+}