diff --git a/redmine/app/views/projects/gantt.rfpdf b/redmine/app/views/projects/gantt.rfpdf
index 4da789b..cd412f5 100644
--- a/redmine/app/views/projects/gantt.rfpdf
+++ b/redmine/app/views/projects/gantt.rfpdf
@@ -117,7 +117,7 @@ pdf.SetFont('Arial','B',7)
 	i_start_date = (i.start_date >= @date_from ? i.start_date : @date_from )
 	i_end_date = (i.due_date <= @date_to ? i.due_date : @date_to )
 	
-	i_done_date = i.start_date + ((i.due_date - i.start_date)*i.done_ratio/100).floor
+	i_done_date = i.start_date + ((i.due_date - i.start_date+1)*i.done_ratio/100).floor
 	i_done_date = (i_done_date <= @date_from ? @date_from : i_done_date )
 	i_done_date = (i_done_date >= @date_to ? @date_to : i_done_date )
 	
diff --git a/redmine/app/views/projects/gantt.rhtml b/redmine/app/views/projects/gantt.rhtml
index 5133466..cb515cd 100644
--- a/redmine/app/views/projects/gantt.rhtml
+++ b/redmine/app/views/projects/gantt.rhtml
@@ -202,7 +202,7 @@ top = headers_heigth + 12
 	i_start_date = (i.start_date >= @date_from ? i.start_date : @date_from )
 	i_end_date = (i.due_date <= @date_to ? i.due_date : @date_to )
 	
-	i_done_date = i.start_date + ((i.due_date - i.start_date)*i.done_ratio/100).floor
+	i_done_date = i.start_date + ((i.due_date - i.start_date+1)*i.done_ratio/100).floor
 	i_done_date = (i_done_date <= @date_from ? @date_from : i_done_date )
 	i_done_date = (i_done_date >= @date_to ? @date_to : i_done_date )