'Day of the Lord' in the Bible

The sun shall be turned into darkness, and the moon into blood, before that great and terrible day of the Lord comes.

that we deliver such a one over to Satan, for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.

as some of you also acknowledge us, that we are the cause of your rejoicing, even as you, also, are of ours, in the day of the Lord Jesus.

for you yourselves know perfectly that the day of the Lord so comes as a thief in the night:

that you be not hastily shaken from the persuasion of your mind, nor be troubled, neither by spirit, nor by report, nor by letter as written by us, as though the day of the Lord is at hand.

But the day of the Lord will come as a thief, in which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, and the earth, and the works that are on it, shall be burned up.