diff --git a/module/programplan/model.php b/module/programplan/model.php
index 2119433318..61d186ffdf 100755
--- a/module/programplan/model.php
+++ b/module/programplan/model.php
@@ -205,7 +205,7 @@ class programplanModel extends model
             $data->textColor     = $this->lang->execution->gantt->stage->textColor;
             $data->bar_height    = $this->lang->execution->gantt->bar_height;
 
-            if($data->endDate > $data->start_date) $data->duration = helper::diffDate($data->endDate, $data->start_date) + 1;
+            if($data->endDate > $data->start_date) $data->duration = helper::diffDate(substr($data->endDate, 0, 10), substr($data->start_date, 0, 10)) + 1;
             if($data->start_date) $data->start_date = date('d-m-Y', strtotime($data->start_date));
             if($data->start_date == '' or $data->endDate == '') $data->duration = 1;
 
@@ -294,7 +294,7 @@ class programplanModel extends model
                 $data->owner_id = join(',', $assigneds);
             }
 
-            if($data->endDate > $data->start_date) $data->duration = helper::diffDate($data->endDate, $data->start_date) + 1;
+            if($data->endDate > $data->start_date) $data->duration = helper::diffDate(substr($data->endDate, 0, 10), substr($data->start_date, 0, 10)) + 1;
             if($data->start_date) $data->start_date = date('d-m-Y', strtotime($data->start_date));
             if($data->start_date == '' or $data->endDate == '') $data->duration = 1;