'Day' in the Bible

when he shall come to be glorified in his saints, and to be marvelled at in all them that believed (because our testimony unto you was believed) in that day.

to the end that ye be not quickly shaken from your mind, nor yet be troubled, either by spirit, or by word, or by epistle as from us, as that the day of the Lord is just at hand;

neither did we eat bread for nought at any man's hand, but in labor and travail, working night and day, that we might not burden any of you: