<P> Following the Second Vatican Council, the Catholic Church's Latin Church, hoping to restore their character as the prayer of the entire Church, revised the liturgical book for the celebration of the Divine Office, and published it under the title "Liturgy of the Hours". </P> <P> The Council itself abolished the office of Prime, and envisioned a manner of distributing the psalms over a period of more than 1 week . In the succeeding revision, the character of Matins was changed to an Office of Readings so that it could be used at any time of the day as an office of Scriptural and hagiographical readings . Furthermore, the period over which the Psalter is recited has been expanded from one week to four . The Latin hymns of the Roman Office were in many cases restored to the pre-Urban form, albeit several of them were shortened . </P> <P> This new "Liturgy of the Hours" (Liturgia Horarum in Latin) is published by Libreria Editrice Vaticana in four volumes, arranged according to the liturgical seasons of the Church year . </P> <Ul> <Li> Volume I: Advent & Christmastide </Li> <Li> Volume II: Lent, the Sacred Triduum & Eastertide </Li> <Li> Volume III: Weeks 1 to 17 of the Year </Li> <Li> Volume IV: Weeks 18 to 34 of the Year </Li> </Ul>

When was the liturgy of the hours created