'Day' in the Bible

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

the work of each one will become evident. For the day will reveal [it], because it will be revealed with fire, and the fire itself will test the work of each one, of what sort it is.

[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.

nor commit sexual immorality, as some of them committed sexual immorality, and twenty-three thousand fell in one day,

and that he was buried, and that he was raised up on the third day according to the scriptures,

I die every day--yes indeed, by my boasting in you, which I have in Christ Jesus our Lord!

On the first [day] of the week, each one of you {put aside} [something], saving up {to whatever extent he has prospered}, in order that whenever I come, at that time collections do not take place.