'Day' in the Bible

At his coming, when he will have glory in his saints, and will be a cause of wonder in all those who had faith (because our witness among you had effect) in that day.

That you may not be moved in mind or troubled by a spirit, or by a word, or by a letter as from us, with the suggestion that the day of the Lord is even now come;

And we did not take food from any man for nothing, but were working hard night and day not to be a trouble to any of you: