Double-clicking on the panel clock's calendar brings up the evolution calendar, but it doesn't show the day that was selected in the clock's calendar. It should. Also, it should close the clock's calendar and use startup notification, since it takes some time for evolution to come up.
Yes, it seems to come up with a new window containing whatever view the last calendar window had selected (e.g. week view, month view, etc). I agree that it should show the day view for the day you double-clicked on.
Looks like the necessary work has already been done and is sitting unapplied in upstream bugzilla; gnome-panel clock needs patching, evolution doesn't: http://bugzilla.gnome.org/show_bug.cgi?id=162305 Changing component to gnome-panel and reassigning.
Oops; didn't see the evolution patch as well... So both evolution and gnome-panel will need patching...
(I created bug 172234 to track the necessary work to evolution that will need to happen before the gnome-panel patch will work)
Reassigning back to me to keep it easier to work on.
We'll pull this in when it gets into upstream. There are appropriate upstream bugs which will handle it and there's no reason to diverge from them, which could potentially introduce bugs. Marking UPSTREAM.