I'd like to echo this request (sorry for the gravedigging, but I think both use cases could benefit from this "today" feature) , but for the opposite reason. There are songs in my autoplaylists that I'd like to "suspend" until a certain date (say, to give a song a break due to overplaying).
I'd like to add a date field at which point the suspended song can resume being mixed in. So the "SuspendUntilDate" field would have to be before "Today". But there is no way to select "Today" as a parameter for date fields.