St. John Chrysostom’s statement about the apparent discrepancies in the Gospels may seem to be a denial of inerrancy but I am not so sure that this is the case. First remember that this is the same Chrysostom who wrote on Genesis,
Don’t worry, dearly beloved; don’t think Sacred Scripture ever contradicts itself. Learn instead the truth of what it says, hold fast to what it teaches in truth, and close your ears to those who speak against it. (Homilies on Genesis 4.8)
You may think that he is speaking only of “important” matters such as the truth of the Incarnation, but the context here is that he is arguing against those who assert from Scripture that there are multiple heavens, instead saying that there is only a single heaven, the “firmament” mentioned in Genesis. Maybe you will say that the existence of only a single heaven is an important dogma that is essential for salvation, but I think most would disagree unless it were the explicit teaching of Scripture.
The place where he speaks about the discrepancies in the Gospels is from his Homily I on Matthew.
“But the contrary,” it may be said, “hath come to pass, for in many places they are convicted of discordance.” Nay, this very thing is a very great evidence of their truth. For if they had agreed in all things exactly even to time, and place, and to the very words, none of our enemies would have believed but that they had met together, and had written what they wrote by some human compact; because such entire agreement as this cometh not of simplicity. But now even that discordance which seems to exist in little matters delivers them from all suspicion, and speaks clearly in behalf of the character of the writers.
But if there be anything touching times or places, which they have related differently, this nothing injures the truth of what they have said. And these things too, so far as God shall enable us, we will endeavor, as we proceed, to point out; requiring you, together with what we have mentioned, to observe, that in the chief heads, those which constitute our life and furnish out our doctrine, nowhere is any of them found to have disagreed, no not ever so little.
But what are these points? Such as follow: That God became man, that He wrought miracles, that He was crucified, that He was buried, that He rose again, that He ascended, that He will judge, that He hath given commandments tending to salvation, that He hath brought in a law not contrary to the Old Testament, that He is a Son, that He is only-begotten, that He is a true Son, that He is of the same substance with the Father, and as many things as are like these; for touching these we shall find that there is in them a full agreement.
And if amongst the miracles they have not all of them mentioned all, but one these, the other those, let not this trouble thee. For if on the one hand one had spoken of all, the number of the rest would have been superfluous; and if again all had written fresh things, and different one from another, the proof of their agreement would not have been manifest. For this cause they have both treated of many in common, and each of them hath also received and declared something of his own; that, on the one hand, he might not seem superfluous, and cast on the heap to no purpose; on the other, he might make our test of the truth of their affirmations perfect. (Homilies on Matthew 1.6)
He says in this passage that minor differences in times and places are not important,
but I am not sure that this is a denial of inerrancy on his part. His argument is against those who say that the Scriptures are entirely untrustworthy and riddled with error. First, he would have to establish the truth of Scripture in basic matters before he could begin an argument for total inerrancy. He also says, “But that they are not opposed to each other, this we will endeavor to prove, throughout the whole work. And thou, in accusing them of disagreement, art doing just the same as if thou were to insist upon their using the same words and forms of speech” (1.8), though it is not clear to me whether he intends to extend that to the apparent discrepancies of place and time that he mentioned above. Another significant point is that he only says that there discord “seems to exist in little matters.”
To establish definitively that he intends that there are errors in the Gospels, it would be incumbent on someone with a greater familiarity of Chrysostom’s commentaries than me to show some place where he points out a discrepancy in “little matters” and excludes any possibility of reconciliation. Otherwise, I would be inclined from what I have read that he believed that such discrepancies are only apparent and not actual. Your example of the angels at the tomb is a great example. The presence of two angels does not exclude the presence of one because each angel is only one angel considered by himself. But even if he would admit true discrepancies in “little matters,” I don’t think he would concerning the date of our Lord’s Passion because it is such a significant event.