diff --git a/components/tvplanit/source/vpganttview.pas b/components/tvplanit/source/vpganttview.pas
index e20e01030..608f96b0d 100644
--- a/components/tvplanit/source/vpganttview.pas
+++ b/components/tvplanit/source/vpganttview.pas
@@ -18,7 +18,7 @@ type
   TVpGanttSpecialDayMode = (sdmColumn, sdmHeader);
 
 const
-  DEFAULT_GANTTVIEWOPTIONS = [
+  DEFAULT_GANTTVIEW_OPTIONS = [
     gvoActiveDate, gvoHorizGrid, gvoVertGrid, gvoWeekends, gvoHolidays
   ];
 
@@ -134,6 +134,7 @@ type
     FOptions: TVpGanttViewOptions;
     FSpecialDayMode: TVpGanttSpecialDayMode;
     FTimeFormat: TVpTimeFormat;
+    FWeekStartsOn: TVpDayType;
 
     FOnAddEvent: TVpOnAddNewEvent;
     FOnDeletingEvent: TVpOnDeletingEvent;
@@ -168,6 +169,7 @@ type
     procedure SetTextMargin(AValue: Integer);
     procedure SetTopRow(AValue: Integer);
     procedure SetWeekendColor(AValue: TColor);
+    procedure SetWeekStartsOn(Value: TVpDayType);
 
   protected
     // Needed by the painter
@@ -317,13 +319,14 @@ type
     property LineColor: TColor read FLineColor write SetLineColor default DEFAULT_LINECOLOR;
     property MonthFormat: String index 1 read GetDateFormat write SetDateFormat stored IsStoredDateFormat;
     property MonthFormat_short: String index 2 read GetDateFormat write SetDateFormat stored IsStoredDateFormat;
-    property Options: TVpGanttViewOptions read FOptions write SetOptions default DEFAULT_GANTTVIEWOPTIONS;
+    property Options: TVpGanttViewOptions read FOptions write SetOptions default DEFAULT_GANTTVIEW_OPTIONS;
     property PopupMenu: TPopupMenu read GetPopupMenu write SetPopupMenu;
     property RowHeaderAttributes: TVpGanttRowHeaderAttributes read FRowHeaderAttributes write FRowHeaderAttributes;
     property SpecialDayMode: TVpGanttSpecialDayMode read FSpecialDayMode write SetSpecialDayMode default sdmColumn;
     property TextMargin: Integer read FTextMargin write SetTextMargin default 2;
     property TimeFormat: TVpTimeFormat read FTimeFormat write FTimeFormat default tf12Hour;
     property WeekendColor: TColor read FWeekendColor write SetWeekendColor default WEEKEND_COLOR;
+    property WeekStartsOn: TVpDayType read FWeekStartsOn write SetWeekStartsOn default dtSunday;
     // inherited events
     property OnClick;
     // new events
@@ -467,9 +470,9 @@ begin
   FDateFormat[1] := DEFAULT_MONTHFORMAT;
   FDateFormat[2] := DEFAULT_MONTHFORMAT_SHORT;
   FDrawingStyle := ds3d;
+  FOptions := DEFAULT_GANTTVIEW_OPTIONS;
   FScrollBars := ssBoth;
-
-  FOptions := DEFAULT_GANTTVIEWOPTIONS;
+  FWeekStartsOn := dtSunday;
 
   // Popup menu
   FDefaultPopup := TPopupMenu.Create(Self);
@@ -1710,6 +1713,14 @@ begin
   end;
 end;
 
+procedure TVpGanttView.SetWeekStartsOn(Value: TVpDayType);
+begin
+  if FWeekStartsOn <> Value then begin
+    FWeekStartsOn := Value;
+    Invalidate;
+  end;
+end;
+
 procedure TVpGanttView.SpawnEventEditDialog(IsNewEvent: Boolean);
 var
   AllowIt: Boolean;