diff --git a/app/adminapi/logic/cost_project/CostApprovedProjectLogic.php b/app/adminapi/logic/cost_project/CostApprovedProjectLogic.php
index 64e26ffe3..379b0c67b 100644
--- a/app/adminapi/logic/cost_project/CostApprovedProjectLogic.php
+++ b/app/adminapi/logic/cost_project/CostApprovedProjectLogic.php
@@ -50,7 +50,7 @@
 			$data['contract_type_text'] = $data->contract_type_text;
 			$data['review_status_text'] = $data->review_status_text;
 			$data['project_director'] = Admin::where('id', $data['signed_head'])->value('name');
-			$data['jhgq'] = bcdiv(bcsub($data['end_date'],$data['start_date']),86400,1);
+			$data['jhgq'] = bcdiv(bcsub(strtotime($data['end_date']),strtotime($data['start_date'])),86400,1);
 			return $data->toArray();
 		}