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https://devcentral.f5.com/codeshare/time-based-irule-example

when RULE_INIT {

    Start of maintenance window in YYYY-mm-dd HH:MM format
   set static::start_date "2016-05-29 18:45"

    End of maintenance window in YYYY-mm-dd HH:MM format
   set static::end_date "2017-05-29 18:45"

    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 {

    Get the current time in seconds since the Unix epoch of 0-0-1970
   set now [clock seconds]
    Check if the current time is between the start and end times
   if {$now > $static::start and $now < $static::end}{
      HTTP::respond 301 Location "https://domain.com/"
   }
    Default action is to use the virtual server default pool
}