The Octave Day of St. John the Evangelist is of double rite and the liturgical colour of the day is white.
At Mattins the invitatory is Regem Apostolorum Dominum, Venite adoremus and the Office hymn is Aeterna Christi munera, as on the feast itself, sung with the Doxology of the Incarnation. In the first nocturn the antiphons In omnem terram etc are sung with psalms 18, 33 & 44. The lessons are from the fourth chapter of the Book of the Apocalypse. These lessons are the same as in modern (i.e. until the 1911-13 reform) editions of the Breviary. The responsories are those proper to the feast. In the second nocturn the antiphons Principes populorum etc are sung with psalms 46, 60 & 63 and the lessons are from a tract of St. Augustine on St. John. The sixth lesson is substantially longer than that found in modern editions. In the third nocturn the antiphons Exaltabuntur etc are sung with psalms 74, 96 & 98. The homily on St. John's Gospel is from St. Chrysostom. These are, again, significantly longer than those found in the post-Clementine editions and the ninth lesson is entirely absent from the modern editions. The Te Deum is sung.
At Lauds the antiphons Valde honorandus est etc. The Office hymn is Exultet caelum laudibus sung, of course, with the Doxology of the Incarnation. After the collect of the feast a commemoration is sung of the Octave of the Holy Innocents.
At the Hours the same antiphons from Lauds, Valde honorandus est etc., are sung in the normal sequence. At Prime the festal psalms are sung (53, 118i & 118ii), the lectio brevis is In medio Ecclesiae.
Mass is sung after Terce. The Gloria is sung. The second collect if of the Octave of the Holy Innocents. The Credo is sung and the preface is of the Nativity.
At Vespers the antiphons Valde honorandus etc are sung with psalms 109, 112, 115, 125 & 138. The Office hymn is Exultet caelum laudibus. After the collect of the feast a commemoration is sung of the following Octave Day of the Holy Innocents.