How to check daily_profit with mq4

Hi, I use below code to check daily profit. I will stop EA when daily profit reached to the target.

But when I first time attach the EA on the chart and check the daily profit value, it shows account equity.

I wonder why...

It should be zero when I attach the EA for the first time.

double daily_profit()
{
 double prof=0;
 int trade;
 int trades=OrdersHistoryTotal();
 
for(trade=0;trade<trades;trade++) {
  OrderSelect(trade,SELECT_BY_POS,MODE_HISTORY);  
  if(OrderMagicNumber() == MagicNumber && OrderSymbol() == Symbol()) {   
   if(OrderCloseTime() >= iTime(Symbol(),1440,0)) prof += OrderProfit() + OrderSwap() + OrderCommission(); }}
 
for(trade=0;trade<OrdersTotal();trade++) {
  OrderSelect(trade,SELECT_BY_POS,MODE_TRADES);  
  if(OrderMagicNumber() == MagicNumber && OrderSymbol() == Symbol()) {   
   if(OrderOpenTime() >= iTime(Symbol(),1440,0)) prof += OrderProfit() + OrderSwap() + OrderCommission(); }}
 return(prof);
}