'Day of the Lord' in the Bible

The sun will be changed to darkness and the moon to blood, before the great and glorious day of the Lord comes.

[I have decided] to hand over such a person to Satan for the destruction of the flesh, in order that his spirit may be saved in the day of the Lord.

for [you] yourselves well know that the day of the Lord is coming in the [same] way as a thief in the night.

that you not be easily shaken from your composure, nor be troubled either by a spirit or by a message or by a letter {alleged to be from us}, to the effect that the day of the Lord has arrived.

But the day of the Lord will come like a thief, in which the heavens will disappear with a rushing noise, and the celestial bodies will be destroyed [by] being burned up, and the earth and the deeds [done] on it will be disclosed.