do you mean the part about sun turning dark will become true later? because Peter said the first part had become true at during Jesus earthly ministry and at pentecost day.
Yes, the darkening of the sun, moon, and stars will go dark before Armageddon.
Joel 3:14–16 KJV
14 Multitudes, multitudes in the valley of decision: for the day of the
Lord is near in the valley of decision.
15 The sun and the moon shall be darkened, and the stars shall withdraw their shining.
16 The Lord also shall roar out of Zion, and utter his voice from Jerusalem; and the heavens and the earth shall shake: but the Lord will be the hope of his people, and the strength of the children of Israel.
Joel foresaw the sun and moon go dark before the battle of Armageddon starts. The stars also will stop shining over Israel because a solar eclipse causes a twilight condition. Twilight occurs because there is still enough light in the sky to prevent someone from seeing the stars. We now have a similar condition immediately after sunset.
But the sun will be darkened and the moon as blood in the 6th seal when the nuclear war causes the heavens to roll up as a scroll.
Joel 2:27–32 KJV
27 And ye shall know that I am in the midst of Israel, and that I am the Lord your God, and none else: and my people shall never be ashamed.
28 And it shall come to pass afterward, that I will pour out my spirit upon all flesh; and your sons and your daughters shall prophesy, your old men shall dream dreams, your young men shall see visions:
29 And also upon the servants and upon the handmaids in those days will I pour out my spirit.
30 And I will shew wonders in the heavens and in the earth, blood, and fire, and pillars of smoke.
31 The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the Lord come.
32 And it shall come to pass, that whosoever shall call on the name of the Lord shall be delivered: for in mount Zion and in Jerusalem shall be deliverance, as the Lord hath said, and in the remnant whom the Lord shall call.
The Old Testament prophet Joel also foresaw the nuclear war. He described the atomic bombs as pillars of fire and smoke with vaporized blood in them. The effects of the blasts turned the sun into darkness and the moon into blood. Please notice the word “before” in verse thirty-one. The nuclear war will be in the first half of the seven-year tribulation before the great and terrible day of the Lord which starts in the middle of the tribulation period.
Revelation 6:12–17 KJV
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;
13 And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind.
16 AMERICA’S LAST WARNING
14 And the heaven departed as a scroll when it is rolled together; and
every mountain and island were moved out of their places.
15 And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bondman, and every free man, hid themselves in the dens and in the rocks of the mountains;
16 And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb:
17 For the great day of his wrath is come; and who shall be able to stand?
The New Testament apostle John, the one who was a member of Jesus’ inner circle, also foresaw the nuclear war in a vision God gave to him after John was imprisoned on the Isle of Patmos. He said that it looked as though the stars fell and caused the heavens to roll up as a scroll. John also described the sun as darkened and the moon as blood. He wrote that people will look for caves or places underground to try and survive when the great day of the wrath of the Lamb comes. Everyone will finally believe that the judgment is truly of the Lord. The nuclear war will cause great earthquakes so that the mountains shake.