Looking to create a time function

I want to use a scalping type ea i am working on the process being that

it views the market over the last 10min (1min timeframe)

Trades for the next 10min /bars

Closes all trades after this

Waits 10min and starts again

I am trying to figure out howo do this and thought of this

string StartTime ="6:30", CloseTime ="6:40" // StartTime and CloseTime

iStartTime=TimeToString(StartTme); /convert StartTime String to time format
cCloseTime=TimeToStr(CloseTime);/ convert CloseTime

}
If (TimeCurrent() >= StrToTime(CloseTime)) //close all orders
cCloseTime = cCloseTime+i; // add 20min to cCloseTime
CloseTime=TimeToStr(cCloseTime);// Convert back to string

}
If (TimeCurrrent()=StartTime // open orders
i=i+1200;
iStartTime=iStartTime+i; //add 20min to iStartTime
StartTime=TimeToStr(StartTime); //convert back to string

}
}