'Day' in the Bible

I thank God, whom I serve as my forefathers did, with a pure conscience. How unceasing is my memory of you in my petitions, night and day

For this cause I also suffer these things. Yet I am not ashamed, for I know him whom I have believed, and I am persuaded that he is able to guard that which I have committed to him against that day.

(the Lord grant to him to find the Lord's mercy in that day); and in how many things he served at Ephesus, you know very well.

From now on, there is stored up for me the crown of righteousness, which the Lord, the righteous judge, will give to me on that day; and not to me only, but also to all those who have loved his appearing.