=== NOT WORKING ===
exten => 450,1,GotoIfTime(9:00-19:33,mon-fri,*,*?nightmode)
	same => n,Playback(tt-monkeys)

exten => nightmode,1,Answer()
	same => n,Playback(vm-leavemsg)
	same => n,Wait(3)
	same => n,Hangup()

=== WORKING ===
exten => 450,1,GotoIfTime(9:00-19:33,mon-fri,*,*?nightmode,1)
    same => n,Playback(tt-monkeys)

exten => nightmode,1,NoOp()
	same => n,Playback(vm-leavemsg)
	same => n,Wait(3)
	same => n,Hangup()