How to block an interface on a schedule

absolute end 18:30 27 April 2014
periodic  Saturday 18:27 to 18:30

If nothing else, correct this first

absolute end 18:30 27 April 2014

The absence of "absolute start" means the policy goes into effect immediately, while the absence of an absolute end means the policy stays unless cancelled.
If the time on your ASA is accurate, then absoute end year of 2014 means the policy should cease to apply by 6:30pm April 27 of 2014. We're now in August 2014 meaning that policy has long expired and has no effect.

Also, in that policy, you're only blocking 3 minutes on Saturdays (6:27pm to 6:30pm).

Lastly, you're applying the policy to outbound traffic on the outside interface. The private IPs would have been translated (NAT'd) meaning you will not see traffic matching 10.x.x.x there. You should consider applying the acl to the INBOUND taffic on the INSIDE Interface instead

I implemented the change but I noticed that will block permanently from the moment I configure the rule.
I would like to implement to block the outside interface on Saturdays and Sundays from 11:00pm to 6:00am the whole year 2014
Please advise

I will apply it tomorrow and give you a feedback.
Thanks

Thanks for the info and the link you provided.

You're welcome.

All the best