Revelation discusses God's day of wrath. Not one day but a period of time. In it will take place God's judgments and the execution thereof. As you will see, the following is to take place before Armageddon, the finalization of God's day of wrath, not one day either (Rev. 6:16, 17; 11:18; 14:10; 16:19; 19:15).
If you read the scriptures in Joel and Acts you would have worked it out. Those scriptures have only been partially fulfilled in the 1st century. E.g., the heavenly phenomena. Note the apostles translated "In the afterwards" (Joel) as "In the last days" (Acts). This all "before the illustrious day of Jehovah arrives." I see a Christian revival in other scriptures to do with the "two witnesses," but that's another story. Suffice to say, God will unite His people. I believe it will happen soon:
28 And after that it must occur that I shall pour out my spirit on every sort of flesh, and YOUR sons and YOUR daughters will certainly prophesy. As for YOUR old men, dreams they will dream. As for YOUR young men, visions they will see.
29 And even on the menservants and on the maidservants in those days I shall pour out my spirit.
30 And I will give portents in the heavens and on the earth, blood and fire and columns of smoke.
31 The sun itself will be turned into darkness, and the moon into blood, before the coming of the great and fear-inspiring day of Jehovah.
32 And it must occur that everyone who calls on the name of Jehovah will get away safe; for in Mount Zion and in Jerusalem there will prove to be the escaped ones, just as Jehovah has said, and in among the survivors, whom Jehovah is calling.
(Joel 2:28-32)
17 And in the last days, God says, I shall pour out some of my spirit upon every sort of flesh, and YOUR sons and YOUR daughters will prophesy and YOUR young men will see visions and YOUR old men will dream dreams;
18 and even upon my men slaves and upon my women slaves I will pour out some of my spirit in those days, and they will prophesy.
19 And I will give portents in heaven above and signs on earth below, blood and fire and smoke mist;
20 the sun will be turned into darkness and the moon into blood before the great and illustrious day of Jehovah arrives.
21 And everyone who calls on the name of Jehovah will be saved.
(Acts 2:17-21 NW)