var
bmp: TBitmap;
begin
bmp := TBitmap.Create;
bmp.LoadFromFile('...');
bmp.Canvas.Brush.Style := bsClear;
bmp.Canvas.TextOut(100,100, '2002-05-24');
bmp.SaveToFile('...');
end;
May be my code has something wrong, please alow me say sorry to you if that.