Everything in the NT is about “the last days,” because the birth of Yeshua marked the beginning of the last days.
The discussion here is about the resurrection, which marks the end of the world domination by the Gentiles, IOW “Mystery Babylon.”
Every direct address to the exact time of that resurrection says either “after the tribulation of those days,” or “at the last trump.”
Can you find a reference that states a different specific time frame?
Read Acts, Chapter 2. You will see clearly that Peter was speaking of the last days. It would be a time of a great revival when all Israel will be saved (Joel 2,3). Read them and understand WHO they were written to and WHAT they say.
NOW read Thessalonians, Corinthians, 1 and 2 Timothy, etc. Paul's speaking of the last days. He CLEARLY speaks of the last days as APOSTACY. NOT REVIVAL. (2 Tim. 3:1,2,5; 4:3,4).
See the differences? The "last days" of the tribulation will be filled with REVIVAL (Peter, Christ, James, John, all the OT saints prophets, especially Joel, John the Baptist, ISRAEL, knew this. It was PROPHECY, concerning the nation ISRAEL, made known FROM THE FOUNDATION OF THE WORLD.
The "last days" of the CHURCH THE BODY OF CHRIST was a SECRET, A MYSTERY, kept SECRET from the foundation of the world, until revealed to Paul from the RISEN Christ. The Body of Christ was NOT KNOWN until Christ revealed it to Paul, and he revealed it to us. His "last days" refers DIRECTLY to OUR condition and OUR future, JUST BEFORE GOD BEGINS THE TRIBULATION. WE are going to experience APOSTACY.
Do you see the huge difference? If one is talking about REVIVAL, and the other is talking about APOSTACY, then they CANNOT be the same. And indeed they aren't. THIS is why 2 Tim. 2:15 is IMPORTANT, and unlocks the key to God's Word. Rightly dividing His Word would have showed you that Peter and Paul were talking about different "last days". BOTH are true. And BOTH come from God's OWN MOUTH. ONE has to do with PROPHECY. And the OTHER has to do with THE MYSTERY, HID IN GOD since the world BEGAN (Ephesians 3:9; Rom. 16,25,26; Eph. 1:4).
If you still don't understand this, try this: completely take Paul out of your Bible (visually, not literally!). Take every mention of him in Acts away. Take Romans through Philemon away. Now, re-read your Bible. You will see an unbroken line of prophecy, from Genesis through Revelation. Prophecy concerning ISRAEL. When Peter stood up on Pentecost and gave his passionate plea, who was he preaching to? Israel. Read Acts 2 again and see. The Bible is 3/4 prophecy. concerning ISRAEL and God. The promises, covenants, prophets, kingdom promises, and setting up His kingdom on earth, in Jerusalem.
The other 1/4 is about a mystery, a secret, hid in God, that the prophets knew nothing about, Peter and the 11 knew nothing about (read Acts 2 again if necessary), and satan knew nothing about. The CHURCH THE BODY OF CHRIST. It has a definite BEGINNING, a MIDDLE (the building of it, how to get in it, what to do once you're in it, etc.), and an END (the RAPTURE of the Body of Christ). When Christ saved Saul, changed his name to Paul, and sent HIM forth to proclaim this MYSTERY, with all its revelations that the risen Christ gave to him, that was the BEGINNING. This is what Romans through Philemon is ALL about.
I hope you can see the differences. It makes Bible study much more enjoyable and understanding when you see those differences CLEARLY. 2 Tim. 2:15 seems quaint. It is the POWERHOUSE of Scripture.
Okay this is one of signs of the apocalypse. you and I are complete agreement on two things.