showing dates messages for admins and no-admins

Related to https://github.com/gururs/gururs/issues/21

The way it is implemented consider that if a user isn't an admin he is part of GURU since the DB registry was created and still is part of it, otherwise if the user is an admin it behaves just like it was already doing.
I'm not sure if this is the expected solution, feel free to reject the pull request and clarify it for me =)