My peripheral trading system generated following trade signal before close today:
"Reverse LONG SPY to SHORT SPY at market close on 2/13/2013"
Alert performance so far (since Jan 8th, 2013): -1.54%. See my previous posts for alert history.
The signal was generated before the trade time indicated in the alert statement. The signals can show up (rarely) before regular market open, (rarely) during regular trading hours, or (mostly) before regular market close.