intraday- looking only at today's bars

["Bill Keyer" <bjkeyer@xxxxxxxxxxxxxx>]

I need some coding help on something that seems to be pretty simple.
I'm stumped on how to write code to only consider bars that have formed
today.
Example: Using intraday data,  I want to buy at the highest(high,5) but I do
not want the code to consider any of yesterday's bars. (So the first bar
that I could execute a buy would be the 6th bar of today's session.)
Any help would be greatly appreciated.

Thanks