[amibroker] narrow down price bars for the current day and between 930 and 1600?

[shakerlr]

I'm pretty new at this, so I was wondering, how do I narrow down the price bar 
array so it is between 930 and 1600 for the current days (and any other days 
back)?  I am trying to do this for the 1 minute chart.

I tried this:

Bars_so_far_today = 1 + BarsSince( Day() != Ref(Day(), -1));
StartBar = ValueWhen(TimeNum() >= 093000, BarIndex()) AND Bars_so_far_today;

but does not seem to work.