'Day of the Lord' in the Bible

The sun shall be turned into darkness, and the moon into blood, before the great and distinguished day of the Lord come:

To deliver such a one to Satan for the ruin of the flesh, that the spirit might be saved in the day of the Lord Jesus.

As also ye observed us by part, that we are your boast, as also ye ours in the day of the Lord Jesus.

For ye yourselves know accurately that the day of the Lord, as a thief in the night, so comes.

And the day of the Lord will come as a thief in the night; in which the heavens shall pass away with a loud noise, and the elements, suffering from excessive heat, shall be dissolved, and the earth and the works in it shall be burned down.