[traderdoc]

if (DayOfWeek() == 5 && TimeHour(TimeCurrent()) == 18)  CloseAll();

void CloseAll() {
   bool res;
   for (int i = OrdersTotal()-1; i >= 0; i--) {
      if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES)) {
         if (OrderSymbol() == Symbol()) {
 	    RefreshRates();
            if (OrderType() == OP_BUY) res = OrderClose(OrderTicket(), OrderLots(), Bid, 1000, Red);
            if (OrderType() == OP_SELL) res = OrderClose(OrderTicket(), OrderLots(), Ask, 1000, Red);
         }  
      }
   }
}

traderdoc