GetInfoAboutOpenTrade - correct
GetInfoAboutOpenTrades - wrong (this is may be just typo in mail)
Following example working ok for me:
Buy("", 1, High, Stop, Day)
Sell("", 1, Low, Stop, Day)
Dim TradeInfo As Array
Dim iEntryDate As Date
If OpenTradeCount() <> 0 Then
GetInfoAboutOpenTrade(TradeInfo, 0)
iEntryDate = TradeInfo[4]
Print iEntryDate
End If