To get AFL code for %change of closing price at 9:18 am

[skumars91s]

Hi
Pls help me for AFL code to get %change of closing price at 9:18 am with respect to previous day's closing.

 

[vamsi_stockdeveloper]

newday=day()!=ref(day(),-1);
pdc=valuewhen(newday,ref(close,-1));
valat918=valuewhen(timenum()==091800,close);
chnage=((valat9-pdc)/pdc)*100;
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