Scripting iCal: get selected date

I’ve been looking now for long enough to make me think I’m either overlooking the obvious, or it’s so obscure that it’s actually impossible.

I’m trying to write a script for iCal that will insert an event on the day currently selected in iCal. I’m having no luck. Seems like maybe iCal has a half-implemented scripting dictionary. Is it just me?

Model: MacPro
AppleScript: 2.0.1
Browser: Safari 531.9
Operating System: Mac OS X (10.5)