23. Nothing is more common in the Word than for the word 'day' to be used to mean the particular time at which events take place, as in Isaiah,

The day of Jehovah is near. Behold, the day of Jehovah comes. I will make heaven tremble, and the earth will be shaken out of its place, on the day of My fierce anger. Its time is close at hand, and its days will not be prolonged. Isaiah 13:6, 9, 13, 22.

And in the same prophet,

Her antiquity is in the days of antiquity. On that day Tyre will be forgotten for seventy years, like the days of one king. Isaiah 23:7, 15.

Since 'day' stands for the particular time it also stands for the state associated with that particular time, as in Jeremiah, Woe to us, for the day has declined, for the shadows of evening have lengthened! Jeremiah 6:4

And in the same prophet,

If you break My covenant that is for the day and My covenant that is for the night, so that there is neither daytime nor night at their appointed time. Jeremiah 33:20, 25.

Also,

Renew our days as of old. Lamentations 5:21.

Feelings of joy and rejoicing flow from our affections, not from our thoughts. Some people might argue that that's not true, that you can rejoice over learning a new idea or having a new thought -- but really you're rejoicing because you have an affection for that idea, or even simply an affection for growing wise (something very strong in men in particular). So when the Bible talks about rejoicing, exulting, or feeling joy, it is talking about an excitement of the affections -- either good or evil. Often the Bible offers this idea in pairings -- "exult and rejoice," for instance, or "rejoice and be glad." Generally this means that the spiritual event is stirring both the affection we have for truth, for thoughts, and the affection we have for doing what is good.