[amibroker] barindex of trade at 11:57 pm on 15 minute chart

[murthysuresh]

hello
how can i find the barindex of the trade at 11:57 at 15 minute chart. i 
am using this formula and since the trade happend at 11:57 the next bar 
date is 00:00:00 next day. it does not work.

exitin15Minute=Name()==STOCKNAME  AND BarIndex()==ValueWhen((DateNum()
==ExitDate)   AND  (TimeNum()>=ExitTime AND Ref(TimeNum(),-1)
<ExitTime) , BarIndex());