'Day' in the Bible

“For the vision is yet for the appointed [future] timeIt hurries toward the goal [of fulfillment]; it will not fail.Even though it delays, wait [patiently] for it,Because it will certainly come; it will not delay.

When I heard, my belly trembled; my lips quivered at the voice: rottenness entered into my bones, and I trembled in myself, that I might rest in the day of trouble: when he cometh up unto the people, he will invade them with his troops.