Sorry I was not more clear. The quotes are from the 1967
Eucharisticum Mysterium No. 28 refer to two other documents including the three times given (I designated them A, B, C) were needed because each case the Communion may occur twice between midnight to midnight. This is, in the case of the Vigil of Nativity and Vigil of Easter, because they were allowable from the start of the liturgical feast after vespers (the previous canonical day) until 6 AM, after which the non-vigil Mass of Christmas or Easter begins. That means the vigil may occur during the six hours after midnight on the same canonical day.
They are 1967
Tres abhinc annos of May 4, 1967, no. 14, and S.C.R. Instruction
Inter Oecumenici, 26. ix. 1964, n. 60-AAS 56 1964. p. 891., which is about the Vigil:
VI. FACULTY OF REPEATING COMMUNION ON THE SAME DAY (SC art. 55)
60. The faithful who receive communion at the Mass of the Easter Vigil or the Midnight Mass of Christmas may receive again at the second Mass of Easter and at one of the Day Masses of Christmas.
SC 55 is Sacrosanctum Concilium:
55. That more perfect form of participation in the Mass whereby the faithful, after the priest’s communion, receive the Lord’s body from the same sacrifice, is strongly commended.
The dogmatic principles which were laid down by the Council of Trent remaining intact
40], communion under both kinds may be granted when the bishops think fit, not only to clerics and religious, but also to the laity, in cases to be determined by the Apostolic See, as, for instance, to the newly ordained in the Mass of their sacred ordination, to the newly professed in the Mass of their religious profession, and to the newly baptized in the Mass which follows their baptism.
vatican.va/archive/hist_councils/ii_vatican_council/documents/vat-ii_const_19631204_sacrosanctum-concilium_en.html