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Recently, people spend plenty of times daily in social network activities, hence a large amount of information is created by people which move up a number of privacy and security issues. While online social networks allow users to configure their privacy settings by specifying who may access to their own shared data, they do not enable them to define the context under which their shared data should be accessed. In order to make the access control mechanism more dynamic and flexible in online social networks, we propose a contextual attributed based access control based on T-JClassic _δϵ to express much more fine grained access control policies than the existing models, so using our model, users can specify their privacy settings based on temporal context.