dear all
i want to forbid this site (www.facebook.com) at this time
from 11:00 pm till 11:00 am (off)
from 11:00 am till 12:00 am (on)
from 12:00 am till 9:00 pm (off)
from 9:00 pm till 11:00 pm (on)
and be note that i have mikrotik version 2.9
please help me this subject is very important for me
You have to upgrade before anyone can really help. The upgrade is free if you have a legit copy of RouterOS.
AFAIK, Mikrotik don’t have any ‘Schedule’ Options available in RULES properties.
To achieve your task, Follow below
# First create an rule rule to block FB,
# Then You have to create 2 Scripts , one that can disable the FB rule, and Second that can Enable the rule,
# Then You have to create Scheduler to trigger both scripts at desired timings.
Some examples are here for quick reference:
_http://aacable.wordpress.com/tag/aacable-mikrotik-scheduler/_
Its much easier in ISA/TMG/SQUID to achieve the same task, but as every one knows that these are dedicated products specifically made for such purposes, and Mikrotik is slightly different product, but Mikrotik have its own style and features list that are not comparable, I love it very much dueto its features and price comparison. Also it have made networking easy and understandable for newbies. It is also reducing the Cisco Domination 
NETWORKING FOR ALL
Actually it does. It is under “Time”.
Here is an example.
http://www.cbrown.co/2011/11/05/disable-access-during-certain-hours
Haha, not near fast enough. 
Thanks for the update, I was not aware of TIME syntax , as I am not updating myself with Mikrotik since long.
Also your blogs looks great. Keep up the good work buddy 
Thanks. I appreciate it.