I never know which to use - the last trade at 15:59:59 or the closing block at 16:00.
Right now I''m leaning towards 15:59:59 on the theory that trading starts at 09:30:00 and market is closed at 16:00, suggesting 15:59:59 is the last trade time in normal market hours. This seems confirmed since most trades seen on the IH "Trades" screen appear as "form t" beginning with 16:00:00.
Barring all that I just wait until the next morning and see what the services tell us it was since ETrade shows the close as whatever trade was made last, AH or not, on the Power ETrade Pro panels.
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