'Day' in the Bible

who will also confirm you to the end, blameless in the day of our Lord Jesus Christ.

each man’s work will become evident; for the day will show it because it is to be revealed with fire, and the fire itself will test the quality of each man’s work.

I have decided to deliver such a one to Satan for the destruction of his flesh, so that his spirit may be saved in the day of the Lord Jesus.

Nor let us act immorally, as some of them did, and twenty-three thousand fell in one day.

and that He was buried, and that He was raised on the third day according to the Scriptures,

On the first day of every week each one of you is to put aside and save, as he may prosper, so that no collections be made when I come.