Thanks.  That's what I had thought for today, but one website that I looked at said that the exchange was open until 4pm today, which confused me.

Also, the settlement date is strange.  My Scotia iTrade account says that the 27th is the last trade date for tax selling in both Canada and the US.  But I thought it was a three-business-day delay on the settlement of all trades, yet a settle on the 27th wouldn't have three more days (just two days on the 28th and 31st).  Perhaps I misunderstood the rule and the date of the trade is counted as the first of the three business days.