'Day' in the Bible

Therefore we regard the message of the prophets as confirmed beyond doubt, and you will do well to pay attention to it, as to a lamp that is shining in a gloomy place, until the day dawns and the morning star rises in your hearts.

for as long as that righteous man lived among them, day after day he was being tortured in his righteous soul by what he saw and heard in their lawless actions

then the Lord knows how to rescue godly people from their trials and to hold unrighteous people for punishment on the day of judgment,

Now by that same word, the present heavens and earth have been reserved for fire and are being kept for the day when ungodly people will be judged and destroyed.

Don't forget this fact, dear friends: With the Lord a single day is like a thousand years, and a thousand years are like a single day.

But the Day of the Lord will come like a thief. On that day the heavens will disappear with a roaring sound, the elements will be destroyed by fire, and the earth and everything done on it will be exposed.

as you look forward to and hasten the coming of the day of God, when the heavens will be set ablaze and dissolved and the elements will melt with fire.

Instead, continue to grow in the grace and knowledge of our Lord and Savior Jesus, the Messiah. Glory belongs to him both now and on that eternal day! Amen.