Peter quoted Joel 2:28-32 in Act 2. Sounds to me like what is mentioned in Joel 2:28-32 is something continue going on since Pentecost. How do you see it?
Several of the things Peter prophesied about in Acts 2 have been ongoing during the Church Age. God’s Spirit has been poured out on His servants, there have been prophecies, visions and dreams. There have also been wonders in Heaven and signs on the Earth below. Everyone who has called on the name of the Lord has been saved.
But the sun going dark and the moon turning blood red before the great and dreadful Day of the Lord is a reference to the 6th Seal judgment in Rev. 6:12 which will take place before the beginning of the Great Tribulation.
By the way, Rev. 6:12 is the only time in the Bible when the moon will turn to blood or turn blood red. All the other references to blood moons you hear these days are man made and are simply lunar eclipses. Throughout history lunar eclipses have never been called blood moons by any source until recently.
Also, notice in Rev. 6:12 the sun goes dark at the same time that the moon is turning red. You can’t have a lunar eclipse unless the sun is shining. Rev. 6:12 describes a never before seen supernatural signal that the most fearsome event in the history of the world is about to begin.