The time of God's wrath is referred to in both the old and the new testament. It is a historic event in which God starts to deal directly with the satanic forces and the evil people responsible for the destruction of the earth. This event lasts for a period of time, but is referred to as "the day" of the Lord, or the day of His wrath. We read in the old testament, in the book of Isaiah that it is in order to destroy all the land and to destroy evil men.
Isaiah 13:5-11 They come from a far country, from the end of heaven, even the Lord, and the weapons of his wrath to destroy all the land. Howl for the day of YHWH is at hand. It shall come as destruction from the almighty...Behold the day of the Lord comes, cruel both with wrath and fierce anger, to lay the land desolate: and he shall destroy the sinners thereof out of it...And I will punish the world for their evil, and the wicked for their iniquity; and I will cause the arrogance of the proud to cease, and will lay low the haughtiness of the terrible
Isaiah 13:12 I will make man more precious than fine gold; even a man than the gold of Ophir.
Isaiah 66:15 For behold, the LORD will come in fire And His chariots like the whirlwind, To render His anger with fury, And His rebuke with flames of fire.
Isaiah 66:16 For the LORD will execute judgment by fire And by His sword on all flesh, And those slain by the LORD will be many.
It is preceded and/or accompanied by signs:
Joel 3:30 I shall give signs in the heavens and in the earth, blood and fire and columns of smoke. The sun shall be turned to darkness and the moon to blood before the coming of the great and awesome day of YHWH
Isaiah 13:10 For the stars of heaven and the constellations thereof shall not give their light: the sun shall be darkened in his going forth, and the moon shall not cause her light to shine
Isaiah 13:13 Therefore I will shake the heavens, and the earth shall remove out of her place, in the wrath of the Lord of hosts, and in the day of his fierce anger.
In the new testament it is also referred as the wrath or anger of God.
Re 6: 17 … the great day of their wrath has come and who is able to stand
Re 5: 7 … seven golden bowls that were full of the anger of god
Re 15: 1 … go and pour out the seven bowls of the anger of god into the earth
Re 19: 15 … he treads too the winepress of the anger of the wrath of god the almighty.
The same signs that precede the wrath of God, as stated in the old testament are given in the new testament.
Re 6: 12 … when he opened the sixth seal, and a great earthquake occurred, and the sun became black as sackcloth of hair, and the entire moon became as blood, and the stars of heaven fell.
Acts 2:20 The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come:
The signs that occur before the day of God's wrath are the same as the signs for the return of Christ to rapture his people. God's wrath comes upon those who are left behind on Earth.
Mark 13:24-25 … the sun will be darkened, and the moon will not give its light, and the stars will be falling out of heaven and the powers that are in the heavens will be shaken.
Luke 21:25 … there will be signs in sun and moon and stars, and on the earth anguish of nations….for the powers of the heavens will be shaken.
Before the Messiah returns and the rapture takes place, these aforementioned signs have to occur. We are looking forward to the fulfillment of these prophecies and the signs of His coming. If you want to know where we stand in the timeline of these prophecies, read Timeline.