[asterisk-gui] Set Variable from Incoming Calling Rules

[LCA]

I've got three calling rules set up for my home phone number (too_early, day_time, and too_late).  I'd like to set a variable based on which time interval was matched and then jump to a voice menu.  Once inside the voice menu I planned on checking the variable and then branching accordingly.  Any suggestions as to how to set a varable?
thanks