Limiting access by time of day.

Is it possible to use a PIX to allow access through a firewall based on
the time of day.
 
i.e Allow TCP/IP outbound to SomeNetSomewhere between 10pm and 3am ?
 
Pointers and help would be appreciated.
 
--
Rob Thatcher 
  
  
Schneider Trading 
One Whittington Avenue, 
London, EC3V 1LE. 
Telephone: 020 7664 4200 
Fax: 020 7664 4333  
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