'Day' in the Bible

when he shall have come to be glorified in his saints, and wondered at in all that have believed, (for our testimony to you has been believed,) in that day.

that ye be not soon shaken in mind, nor troubled, neither by spirit, nor by word, nor by letter, as if it were by us, as that the day of the Lord is present.

nor have we eaten bread from any one without cost; but in toil and hardship working night and day not to be chargeable to any one of you: