You seriously need to do a study on the DOTL then. Consider the following, for example.
Amos 5:18 Woe unto you that desire the day of the LORD! to what end is it for you? the day of the LORD is darkness, and not light.
Amos 5:20 Shall not the day of the LORD be darkness, and not light? even very dark, and no brightness in it?
These are examples of what the DOTL is like in general. It's not going to be involving anything pleasant.
Nowhere in Acts 2 does it ever say the DOTL began back then. It instead tells us that what began back then precedes the DOTL in the future. You are conflating things here.
Acts 2:19 And I will shew wonders in heaven above, and signs in the earth beneath; blood, and fire, and vapour of smoke:
20 The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come:
Verse 20 says---before that great and notable day of the Lord come, first the sun shall be turned into darkness, and the moon into blood. Now it's just a simple matter of looking in Matthew 24 and Revelation 6 to see where in the timeline of events verse 20 fits.
Matthew 24:29 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
This verse places Acts 2:20 immediately after great tribulation.
Revelation 6:12 And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood;
This verse places Acts 2:20 during the 6th seal.
There is no way in a million years when Peter said what he did at the time in Acts 2:14, that they were already in the era of time involving Matthew 24:29 and Revelation 6:12.
BTW, I guess this is another example of you proving what you allege with the Bible itself, right?
You have no understanding of the prophecy regarding the day of the Lord because you're trying to force it into your unbiblical doctrinal timeframe, i.e. one thousand literal years, seven literal years, 42 literal months, 1260 literal days etc. etc. etc. You have absolutely ZERO understanding of how the day of the Lord is spiritually fulfilled, and is being spiritually fulfilled, as the Kingdom of God in heaven is being complete through the Gospel proclaimed unto nations of the world then the END shall come!