Title II. The Liturgy of the Hours
Can. 1173 Fulfilling the priestly function of Christ, the Church celebrates the liturgy of the hours. In the liturgy of the hours, the Church, hearing God speaking to his people and recalling the mystery of salvation, praises him without ceasing by song and prayer and intercedes for the salvation of the whole world.
Can. 1174 §1. Clerics are obliged to carry out the liturgy of the hours according to the norm of can. 276, §2, n. 3; members of institutes of consecrated life and societies of apostolic life, however, are bound according to the norm of their constitutions.
§2. Other members of the Christian faithful, according to circumstances, are also earnestly invited to participate in the liturgy of the hours as an action of the Church.
Can. 1175 In carrying out the liturgy of the hours, the true time for each hour is to be observed insofar as possible.