Advanced event time question

[jspeckman]

Hi all,
  I'm trying to create a respond to event that can only happen between 8:00 and 23:00.  Is this possible?  I've tried

time of day > 8:00 and
time of day < 23:00

  with no luck.  The event keeps right on going through the night.  Am I doing it wrong or is it not yet possible?

Thanks,
Jason