'Day' in the Bible

I give praise to God, whose servant I have been, with a heart free from sin, from the time of my fathers, because in my prayers at all times the thought of you is with me, night and day

And for which I undergo these things: but I have no feeling of shame. For I have knowledge of him in whom I have faith, and I am certain that he is able to keep that which I have given into his care till that day.

(May he have the Lord's mercy in that day); and of all he did for me at Ephesus you have full knowledge.

From now on, the crown of righteousness is made ready for me, which the Lord, the upright judge, Will give to me at that day: and not only to me, but to all those who have had love for his revelation.