diff --git a/edit-mode/function/ganttEvent.js b/edit-mode/function/ganttEvent.js
index d334658..6572b34 100644
--- a/edit-mode/function/ganttEvent.js
+++ b/edit-mode/function/ganttEvent.js
@@ -53,7 +53,6 @@ gantt.attachEvent("onBeforeTaskUpdate", function(id,new_item){
     }
     progress = progress/100;
     new_item['progress'] = progress;
-    new_item['start_date'].setHours(0,0,0);
     new_item['end_date'].setHours(23,59,59);
     let newDuration = gantt.calculateDuration({
       start_date: new_item['start_date'],