The following are memorialized on December 28:
Agapes of Nicomedia
Anthony of Lérins
Caesarius of Armenia
Castor
Conindrus
Domitian
Domna of Nicomedia
Domnio of Rome
Eutychius
Gowan of Wales
Holy Innocents
Indes of Nicomedia
Ignatius of Lom
Johannes Riedgasser
Martyrs of Nicomedia
Nicholas Mello
Otto of Heidelberg
Rogatian
Romulus
Theodor of Tabennisi
Theophila of Nicomedia
Victor
December 28 is the feast of the Holy Innocents, the babies murdered by King Herod when he was searching for the Christ Child.
The Feast of the Holy Innocents is observed on December 28. In the eastern church it is observed on December 29.
With the majority of saints, particularly very ancient saints, there is no record of the birth dates. The only date that is recorded is the feast day of the saint which may be the anniversary of the death of the person when the person was reborn into heaven. Therefore, this question can not be answered.
Originally, the feast date of Thomas Aquinas was on March 7, the day he entered heaven. It is unknown to me the reason for the change. You need to know that there are thousands and thousands of saints and each one has a specific feast day. That means that, on any given day, there may be dozens of saints who are celebrated that same day.
Feast day August 28
There is no St. Irene with a feast day of June 28. However, Saint Irenaeus of Lyons has his feast that day.
The feast day of Saint Augustine of Hippo is August 28.
His feast day is September 28.
The feast day for St. Augustine of Hippo is August 28.
The feast day for St. Augustine of Hippo is August 28.
October 28 is the feast of St. Jude.
January 28 is the feast of Saint Thomas Aquinas.