Rules based Booking / Calendar Availability?

Before sitting down to write what I think will be a very complex rules engine, I wanted to check if a package (or best practice) exists for doing the following:

Let's assume I have a timestamp and I want to check this against a group of rules that a user can set up in advance:

• By time e.g. I do not accept bookings between 2 pm and 4 pm
• By date range e.g. I am not accepting bookings between May 1st and May 15th
• By date with time range e.g. I am not accepting bookings between 9 am and 5 pm on June 15th
• By month e.g. I am not accepting bookings between April and July
• By day e.g. I am not accepting bookings on Fridays

Note, a user could set up multiple rules e.g. I do not accept bookings on Wednesday AND between 9 am and 11 am.

The excepted output is true or false, either the input timestamp is 'bookable' or it is not.

So, the question:

• Is there a best practice for this?
• Are there any packages or case studies that demo this type of functionality?
• Would RRULE be of assistance here?