Day and night. The Sun lights up one half of the Earth, and the other half is in shadow. As the Earth spins we move from shadow to light and back to shadow and so on. It is daytime in the UK when our part of the planet is in the lit by the Sun.
All behavior contracts should include basic elements, such as: The contractual parties (e.g., patient, provider/staff, guarantor, family members, etc.); The behaviors you expect from the patient, as well as behavior they can expect. from you and your staff; The consequences of violating the contract terms; and.
This interpretation of the law of contracts is known as the Objective Theory of Contracts. The Objective Theory prevents the interpretations of any law of contract from enforcing ridiculously out-sized claims in advertisements as the offer of a contract. The most famous example of this in business contract law is the Pepsi Harrier Jet case.