i get some problem that cannt del law like
adding success 
iptables -A FORWARD -p tcp -m time --timestart 08:00 --timestop 16:00 --days Mon -j ACCEPT

 delete fail
iptables -D FORWARD -p tcp -m time --timestart 08:00 --timestop 16:00 --days Mon -j ACCEPT
iptables: Bad rule (does a matching rule exist in that chain?)