So this meeting, and Paul’s preaching, took place during the time that we now call Saturday night.
Even if that were true, which it is not, its also a red herring, since the preaching in question still happened on the First Day according to how days were reckoned.
So that proves nothing, since what we now regard ad Saturday Night, they regarded as the eve of the First Day, and thus, the first day is the first day.
However, we know that the descent of the Holy Spirit occurred in the morning of Sunday, because, well, Scripture:
Let’s take a look at Acts chapter 2:
5 Now there were staying in Jerusalem God-fearing Jews from every nation under heaven. 6 When they heard this sound, a crowd came together in bewilderment, because each one heard their own language being spoken. 7 Utterly amazed, they asked: “Aren’t all these who are speaking Galileans?8 Then how is it that each of us hears them in our native language? 9 Parthians, Medes and Elamites; residents of Mesopotamia, Judea and Cappadocia, Pontus and Asia,[
b] 10 Phrygia and Pamphylia, Egypt and the parts of Libya near Cyrene; visitors from Rome 11 (both Jews and converts to Judaism); Cretans and Arabs—we hear them declaring the wonders of God in our own tongues!” 12 Amazed and perplexed, they asked one another, “What does this mean?”
13 Some, however, made fun of them and said, “They have had too much wine.” 14 Then Peter stood up with the Eleven, raised his voice and addressed the crowd: “Fellow Jews and all of you who live in Jerusalem, let me explain this to you; listen carefully to what I say
.15 These people are not drunk, as you suppose. It’s only nine in the morning! 16 No, this is what was spoken by the prophet Joel:….
In some Bible translations, this is rendered as the third hour, which in antiquity in the Greek language, in which Acts was written, referred to the third hour from sunrise. The third hour is usually around 9 AM, hence the translation in question rendering it as such.
But let us say instead it was the third hour after sunset. Well, it would (a) still be Sunday, but (b) St. Peter’s remark would make no sense at all, since by the third hour after sunset, many people are quite drunk indeed, especially in mid May, when the Descent of the Holy Spirit at Pentecost happened.