Internet access time

I hope this is the right place to ask this question. I need to allow an ip address to access internet only from 6pm to 6am. How can I do this? I only have an ip address given.

Regards.

Look at this:

add action=masquerade chain=srcnat out-interface=ETH1 src-address=192.168.1.234 time=8h-16h,sun,mon,tue,wed,thu,fri,sat

You can also make forward rule for this address and limit it to particular time window …

Thank you,
Can u show the forward rule of this address for example