'Day' in the Bible

When he shall come to be glorified in his saints, and to be admired in all them that believe (because our testimony among you was believed) in that day.

That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand.

Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;

Neither did we eat any man's bread for nought; but wrought with labour and travail night and day, that we might not be chargeable to any of you: