'Day' in the Bible

when he comes to be glorified in his saints, and to be admired among all those who have believed (because our testimony to you was believed) in that day.

not to be quickly shaken in your mind, nor yet be troubled, either by spirit, or by word, or by letter as from us, saying that the day of Christ had come.

neither did we eat bread from anyone's hand without paying for it, but in labor and travail worked night and day, that we might not burden any of you;