So, from a broader perspective, perhaps this org-class stuff is not the right way to go. I am also noticing that the icalendar-export does not seem to be exporting these diary-sexps anyway. Perhaps I can use org-clone-subtree-with-time-shift to do most of what I want. 

Best,

Stephen

On Mon, Jan 6, 2014 at 3:35 PM, Nick Dokos <ndokos@gmail.com> wrote:

"Stephen J. Barr" <stevejb@uw.edu> writes:

> What I am now seeing is that the particular date gets picked up, but not the time. Am I doing something incorrect with the
> syntax?
>

No, I believe that's a limitation of what you can do with these
diary-sexps.

You can always add the time to the headline: that way it'll appear in
the agenda (but not in the grid, if you use that, and not sorted
correctly - the time is just a label):

*** Teaching 7:00pm-8:30pm

   <%%(org-class 2014 1 6 2014 3 10 1 1)>

Nick