hello, I am new to the Zorro. I am trying to determine US market open gap on symbol SPY. I am thinking to do something like

BarPeriod = 5;
asset("SPY");
AssetZone = ET;
vars Price = series(price());

TimeFrame=5*12*24; // need to skip market close
vars DailyPrice = series(price());

The problem is I have to skip market close period.. I tried some ways, it doesn't work... can someone help me here ? thanks.