'Day' in the Bible

I am thankful to God, whom I serve from my forefathers with pure conscience, how unceasingly I have the remembrance of thee in my supplications night and day,

For which cause also I suffer these things; but I am not ashamed; for I know whom I have believed, and am persuaded that he is able to keep for that day the deposit I have entrusted to him.

the Lord grant to him to find mercy from the Lord in that day and how much service he rendered in Ephesus thou knowest best.

Henceforth the crown of righteousness is laid up for me, which the Lord, the righteous Judge, will render to me in that day; but not only to me, but also to all who love his appearing.