update import

app/Http/Controllers/ActivityController.php

@@ -396,9 +396,12 @@ class ActivityController extends Controller
         }
       };
     }
+    $projectStart = Project::select('mulai_proyek')->where('id', $projectId)->first();
 		foreach ($data['activities'] as $i => $activity_row) {
-			$startDate = \DateTime::createFromFormat('d-m-y', $activity_row['start_date']);
-			$endDate = \DateTime::createFromFormat('d-m-y H:i:sO', $activity_row['end_date']);
+			$startDate = \DateTime::createFromFormat('Y-m-d H:i:s.uP', $projectStart->mulai_proyek);
+      $endDate = clone $startDate;
+      $endDate->modify('+'.$activity_row['duration'].' days');
+      $endDate->setTime(23, 59, 59);
 			$input['name'] = $activity_row['name'];
 			$input['proyek_id'] = $projectId;
 			$input['version_gantt_id'] = $data['ganttId'];