Burninglight, it would appear that you have been misled by someone or you are not really familiar with "the Day of the LORD", which is the exact opposite from the "Day of Grace" in which we live, and which began with the first coming of Christ and will end with the Resurrection/Rapture of the saints.
Here is a description of the Day of the Lord (Joel 2:1-11), which will actually correspond to the Great Tribulation, and the events described in the 6th and 7th seals of Revelation.
1Blow ye the trumpet in Zion, and sound an alarm in my holy mountain: let all the inhabitants of the land tremble: for the day of the LORD cometh, for it is nigh at hand;
2 A day of darkness and of gloominess, a day of clouds and of thick darkness, as the morning spread upon the mountains: a great people and a strong; there hath not been ever the like, neither shall be any more after it, even to the years of many generations.
3A fire devoureth before them; and behind them a flame burneth: the land is as the garden of Eden before them, and behind them a desolate wilderness; yea, and nothing shall escape them.
4The appearance of them is as the appearance of horses; and as horsemen, so shall they run.
5Like the noise of chariots on the tops of mountains shall they leap, like the noise of a flame of fire that devoureth the stubble, as a strong people set in battle array.
6 Before their face the people shall be much pained: all faces shall gather blackness.
7They shall run like mighty men; they shall climb the wall like men of war; and they shall march every one on his ways, and they shall not break their ranks:
8Neither shall one thrust another; they shall walk every one in his path: and whenthey fall upon the sword, they shall not be wounded.
9They shall run to and fro in the city; they shall run upon the wall, they shall climb up upon the houses; they shall enter in at the windows like a thief.
10 The earth shall quake before them; the heavens shall tremble: the sun and the moon shall be dark, and the stars shall withdraw their shining:
11And the LORD shall utter his voice before his army: for his camp is very great: for he is strong that executeth his word: for the day of the LORD is great and very terrible; and who can abide it?