'Day' in the Bible

who shall also confirm you unto the end, that ye be unreproveable in the day of our Lord Jesus Christ.

each man's work shall be made manifest: for the day shall declare it, because it is revealed in fire; and the fire itself shall prove each man's work of what sort it is.

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

Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.

and that he was buried; and that he hath been raised on the third day according to the scriptures;

Upon the first day of the week let each one of you lay by him in store, as he may prosper, that no collections be made when I come.