General Roman Calendar of Pope Pius XII - Octaves

Octaves

Only the Octaves of Easter, Christmas and Pentecost were to be celebrated; all others occurring either in the universal or in particular calendars were suppressed. The days within the Easter and Pentecost octaves were raised to the Double rite, had precedence over all feasts, and did not admit commemorations. But the days of the Octave of Christmas, although of the Double rite, continued to be celebrated as before.

From January 2 to 5, unless some feast occurred, the Office was to be of the current feria in the simple rite. The Mass was to be the same as that of January 1, but without the Credo and the special Communicantes.

With the suppression of the Octave of Epiphany, the days from January 7 to 12 became feriae per annum (in the Simple rite); the Mass was to be the same as that of the Epiphany, but without the Credo and without the special Communicantes. On January 13, the Commemoration of the Baptism of our Lord was to be celebrated in the major double rite, using for the Office and the Mass those previously said on the Octave of the Epiphany. But if January 13 occurred on Sunday, the Office and Mass were to be those of the "Feast of the Holy Family" without any commemoration of the Baptism of Our Lord.

The days from the Ascension of Our Lord to the Vigil of Pentecost exclusive became feriae of Eastertide (in the Simple rite); the Mass was to be that of the Feast of the Ascension, but without the Credo and the special Communicantes. The days of the suppressed Octaves of Corpus Christi and the Most Sacred Heart of Jesus became feriae per annum.