You can find that field on the "My Holdings" view:
of course - that's where I enter it....but shouldn't it be available as an option to enter a field on any other view? If I'm viewing a summary, for example, I could select just 3 or 4 fields among the sixty or so options, but not the date?
This isn't available in the Summary tab. That would be a feature request.
I'd recommend posting any concerns/ideas for our product group on our Finance feedback board.