Schedule iRule

Here's a simple example as well for 10.x:

when RULE_INIT {

    Start of maintenance window in YYYY-mm-dd HH:MM format
   set static::start_date "2011-05-29 18:45"

    End of maintenance window in YYYY-mm-dd HH:MM format
   set static::end_date "2011-05-29 18:50"

    Convert start/end times to seconds from the epoch for easier date comparisons
   set static::start [clock scan $static::start_date]
   set static::end [clock scan $static::end_date]
}
when CLIENT_ACCEPTED {

   set now [clock seconds]
   if {$now > $static::start and $now < static::end}{
      pool MAINT_POOL
   }
}

Aaron