Converting mql4 to mql5

Hi, 

I need convert bellowed mt4 coding to mt5:

//+-------------------------------------------------------------------------------------------------------------

int CalculateCurrentOrdersHistory()

  {

   int closed_orders=0;

   datetime today_midnight=TimeCurrent()-(TimeCurrent()%(PERIOD_D1*60));

   for(int x=OrdersHistoryTotal()-1; x>=0; x--)

      {

      if(OrderSelect(x,SELECT_BY_POS,MODE_HISTORY) && OrderCloseTime()>=today_midnight)

            closed_orders++;

      }

   return(closed_orders);

  }

//+--------------------------------------------------------------------------------------------------------------

It must be pass on mt5 demo a/c.

Thanks!