'Day of the Lord' in the Bible

The sun will be turned into darkness and the moon into blood, before the great and glorious day of the Lord shall come.

you are to deliver this man to Satan for the destruction of the flesh, so that his spirit may be saved in the day of the Lord Jesus.

as you have understood us in part, that you can be proud of us just as we can be of you, in the day of the Lord Jesus.

For you yourselves know well that the day of the Lord will come like a thief in the night.

not to be quickly shaken in mind or excited, either by spirit or by word, or by letter as if from us, to the effect that the day of the Lord has come.

But the day of the Lord will come like a thief, in which the heavens will pass away with a roar and the elements will be destroyed with fire, and the earth and the works that are in it will be burned up.