diff --git a/view-mode/function/ganttConfig.js b/view-mode/function/ganttConfig.js
index 1b62b0f..26718bf 100644
--- a/view-mode/function/ganttConfig.js
+++ b/view-mode/function/ganttConfig.js
@@ -379,7 +379,7 @@ gantt.templates.task_class = function (start, end, task) {
 		return classes.join(' ');
 	}
 };
-
+let dataOverdue = [];
 gantt.templates.rightside_text = function (start, end, task) {
 	if (task.planned_end) {
 		if (end.getTime() > task.planned_end.getTime()) {
@@ -398,6 +398,15 @@ gantt.templates.rightside_text = function (start, end, task) {
 				end_date: end,
 				task: task
 			}, 'day');
+      let found = dataOverdue.find((element) => element.id == task.id);
+      if (!found) {
+         dataOverdue.push({
+            id: task.id,
+            text: task.text,
+            overdue: overdue
+         })
+      }
+      window.parent.postMessage({ type: 'dataOverdueUpdate', dataOverdue: dataOverdue }, '*');
 			var text = "<b style='color: red;'>Overdue: " + overdue + " days</b>";
 			return text;
 		}