Last updated: Nov 26, 2018
The day of the Lord refers to the day of the Lord's return. On this day, which no man knows, the Lord God will poor out His wrath on the world. The book of Isaiah says the day will come as destruction. This day is sometimes loosely referenced with the phrase "hour," in which the Lord comes or when the great city Babylon has fallen in the book of Revelation.
What is the day of the Lord?
Howl ye; for the day of the LORD is at hand; it shall come as a destruction from the Almighty. Isaiah 13:6
According to Revelation 16:14, it is possible that the day of the Lord occurs on the day known as the battle of Armageddon.
For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty.
One thing is certain; the day of the Lord will come with destruction, judgment and people will hide in fear because of God's wrath. Now is time to watch for the Lord's return so that may be accounted worthy to escape all these things.