Good question, although it is more of an exegetical one. The verses in question are Matthew 24:36 and Mark 13:32 (practically identical):
It is important not to take these verses in isolation from other ones that clearly proclaim the identity of the Father and Son in Essence (as we would say). For example, John 1:1:
and John 10:30
And even verses showing that Jesus has all knowledge:
Anyway, the verses regarding the supposed “ignorance” of Christ don’t seriously threaten the Trinitarian dogmas. None of the Church Fathers ever interpreted them to mean that the Eternal Son is ignorant of something that the Father knows. Positing such ignorance would go against the dogma of the
homoousios, the consubstantiality of the Son with Father, as any post-Nicene Father would have known well.
The question that some of the Fathers (for example Augustine) asked themselves is whether Jesus
in his human nature could possibly have been ignorant of something. Such ignorance would have been deliberate, of course. Hence, some of the Fathers argued, that in this case Jesus deliberately abstained from attempting to learn the hour of his second coming, because it was unfitting for a man to know it.
The other possibility—and one that I frankly find more convincing—was that Jesus actually
did (and does) know the hour of his coming. However, in the face of many importunate questions from his disciples, he made use of a Semitic hyperbole to make it extremely clear that he would
not reveal the hour to them.
Semitic hyperbole is commonly used by Jesus to make a point: for example,
None of Jesus’ hearers understood him literally. In the same vein, there is also,
No one seriously thought that Jesus was instructing them to
hate their own lives, still less their own parents. (After all, there was—and still is!—a commandment that orders us to
honor our father and mother.)
That the verses regarding Jesus’ supposed “ignorance” are of this kind is indicated by the very structure of the verse, which goes in ascending order of intensity:
*]No one knows
*]Not even the angels
*]Not even the Son
*]Only the Father
Translating this into modern English idiom, I think that Jesus was saying, in essence, “for the umpteenth time, I will not tell you the hour of the Second Coming. Don’t even ask me, because the angels don’t know, and as far as you are concerned, I don’t even know.”
Even in English, when someone talks like that, it is a sort of feigned ignorance to let people know that they are not supposed to ask anymore.
This interpretation, in my opinion, is confirmed by Acts 1:7, in which Jesus, in reply to questions as to whether the Kingdom will be established, says,
Anyway, however the “ignorance” passages are interpreted, it is clear that Jesus is not claiming any ignorance as a Divine Person. It is based largely on some of the other passages I mentioned that the Church affirmed the unity of Essence between the Father and the Son.