So the Day of the Lord is a period of time,
beginning with the Rapture of the Church.
The Bible says, it is the day of vengeance;
it is the day of the wrath of God.

Romans Chapter 2 says something about
the people of this world.
"But after thy hardness and impenitent
heart treasurest up unto thyself wrath
against the day of wrath and revelation of
the righteous judgment of God, Who will
render to every man according to his deeds,"
Romans 2:5-6