Irule to block access of VS on specific days

You can try something like that:

when RULE_INIT {
    array set static::timerange {
        1 {"05:30" "13:00"}
        2 {"05:30" "13:00"}
        3 {"05:30" "13:00"}
        4 {"05:30" "13:00"}
        5 {"00:00" "00:00"}
        6 {"00:00" "00:00"}
        7 {"05:30" "13:00"}
    }
}

when HTTP_REQUEST {
    if { ([string tolower [HTTP::uri]] contains "/contractor/") } {    
        set now [clock seconds]
        set current_day [clock format $now -format {%u}]
        lassign $static::timerange($current_day) start end
        if {($now >= [clock scan $start]) && ($now < [clock scan $end])} {
            set denied 0
        } else {set denied 1}
    } else {set denied 0}

    if { $denied } {
        HTTP::respond 200 content "Not Authorised! Contact AdministratorNot Authorised! Contact Administrator..."
    } else {pool POOL_443}
}

you can also use day name instead of number in array...