.

lib/ui/grid/column.js

@@ -296,7 +296,8 @@ export class GridDateColumn extends GridColumn {
         if (col.dateMax != null) {
             date.max = col.dateMax;
         }
-        date.addEventListener('change', trigger);
+        // date.addEventListener('change', trigger);
+        date.addEventListener('blur', trigger);
         return date;
     }
 
@@ -324,6 +325,9 @@ export class GridDateColumn extends GridColumn {
     }
 
     static formatDate(date) {
-        return `${date.getMonth() + 1}/${date.getDate()}/${date.getFullYear()}`;
+        if (date instanceof Date && !isNaN(date)) {
+            return `${date.getMonth() + 1}/${date.getDate()}/${date.getFullYear()}`;
+        }
+        return '';
     }
 }