Grid EA with Order expiration

I have a grid order EA with code. I need EA to close pending orders after 5 minutes. So if orders with magic number 1 open at 00:00, pending orders with magic number 1 are delete at 00:005

See code below

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

//--External variables

extern int    MagicNumber       = 1;//Magic number

extern string EaComment         = "Grid_Template";//Order comment

extern double StaticLot         = 0.01;//Static lots size

extern bool   MM                = false;//Money Management

extern int    Risk              = 2;//Risk %

extern double TakeProfit        = 20.;//Take Profit in pips

extern double StopLoss          = 10.;//Stop loss in pips

extern double PriceDistance     = 15.;//Distance from price in pips

extern double GridStep          = 15.;//Step between grid orders in pips

extern int    GridOrders        = 2;//Amount of grid orders

extern int    PendingExpiration = 15;//Pending expiration after xx minutes

//--Internal variables

double PriceB,PriceS,StopB,StopS,

       TakeB,TakeS,_points,PT,Lots;

int LotDigits;

datetime _e = 0;

int Ticket  = 0;

//--

int OnInit()

  {

//--Determine digits

   _points=MarketInfo(Symbol(),MODE_POINT);

//--

   if(Digits==5 || Digits==3)

      PT = _points*10;

   else

      PT = _points;

//--

   return(INIT_SUCCEEDED);

  }

//--

void OnDeinit(const int reason)

  {

  }

//--

void OnTick()

  {

//If trade allowed and no positions exists by any chart - open a new set of grid orders

   if(IsTradeAllowed() && !IsTradeContextBusy())

     {

      if(PosSelect()==0)

        {

         GridPos(PriceDistance,TakeProfit,StopLoss);//Place grid

        }

      return;

     }

  }

///////////////////////////////////////////////////////////

//Grid order send function

void GridPos(double _Dist,double _Take,double _Stop)

  {

   int i;

   _e=TimeCurrent()+PendingExpiration*60;

//--

   for(i=0; i<GridOrders; i++)

     {

      PriceB = NormalizeDouble(Ask+(_Dist*PT)+(i*GridStep*PT),Digits);

      TakeB  = PriceB + _Take * PT;

      StopB  = PriceB - _Stop * PT;

      Ticket=OrderSend(Symbol(),OP_BUYSTOP,LotSize(),PriceB,3,StopB,TakeB,EaComment,MagicNumber,_e,Green);

      //--

      PriceS = NormalizeDouble(Bid-(_Dist*PT)-(i*GridStep*PT),Digits);

      TakeS  = PriceS - _Take * PT;

      StopS  = PriceS + _Stop * PT;

      Ticket=OrderSend(Symbol(),OP_SELLSTOP,LotSize(),PriceS,3,StopS,TakeS,EaComment,MagicNumber,_e,Red);

     }

   if(Ticket<1)

     {

      Print("Order send error - errcode: ",GetLastError());

      return;

     }

   else

     {

      Print("Grid placed successfully!");

     }

   return;

  }

//////////////////////////////////////////////////////////

//PositionSelector - Determines open positions

int PosSelect()

  {

   int posi=0;

   for(int k = OrdersTotal() - 1; k >= 0; k--)

     {

      if(!OrderSelect(k, SELECT_BY_POS))

        {

         Print("Order pos selection failed - errcode: ",GetLastError());

        }

      if(OrderSymbol()!=Symbol()&&OrderMagicNumber()!=MagicNumber)

        {

         continue;

        }

      if(OrderCloseTime() == 0 && OrderSymbol()==Symbol() && OrderMagicNumber()==MagicNumber)

        {

         if(OrderType() == OP_BUY)

            posi = 1; //Long position

         if(OrderType() == OP_SELL)

            posi = -1; //Short positon

         if(OrderType() == OP_BUYSTOP)

            posi = 1; //Pending Long position

         if(OrderType() == OP_SELLSTOP)

            posi = -1; //Pending Short positon

        }

     }

   return(posi);

  }

////////////////////////////////////////////////////////////

//Lots size calculation

double LotSize()

  {

   if(MM == true)

     { Lots = MathMin(MathMax((MathRound((AccountFreeMargin()*Risk/1000/100)

       /MarketInfo(Symbol(),MODE_LOTSTEP))*MarketInfo(Symbol(),MODE_LOTSTEP)),

       MarketInfo(Symbol(),MODE_MINLOT)),MarketInfo(Symbol(),MODE_MAXLOT));}

   else

     {

      Lots = MathMin(MathMax((MathRound(StaticLot/MarketInfo(Symbol(),MODE_LOTSTEP))*MarketInfo(Symbol(),MODE_LOTSTEP)),

      MarketInfo(Symbol(),MODE_MINLOT)),MarketInfo(Symbol(),MODE_MAXLOT));

     }

   return(Lots);

  }

//+----------------End of Temi's Trader EA-------------------+