datetimepicker如果在获得焦点的时候自动定位到日期上，TDateTimePicker自动焦点定位到年，TDateTimePicker自动焦点定位到月，TDateTimePicker自动焦点定位到日

定位到月上

if key=vk_return then
begin

DTP1.SetFocus;

SendMessage(DTP1.Handle,WM_KEYDOWN,39,0);

end;

定位到日上

if key=vk_return then
begin

DTP1.SetFocus;

SendMessage(DTP1.Handle,WM_KEYDOWN,39,0);

SendMessage(DTP1.Handle,WM_KEYDOWN,39,0);

end;

DTP1.SetFocus;

   SendMessage(DTP1.Handle,WM_KEYDOWN,VK_RIGHT,0);
   SendMessage(DTP1.Handle,WM_KEYDOWN,VK_RIGHT,0)

39是VK_RIGHT的虚拟键值。。通用的，就用上面这个，程序容易理解，就是把焦点移动到dataetimepicker上后，模拟光标vk_right被按下。