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.

602. And when he cried, seven thunders uttered their voices.- That this signifies instruction out of heaven and perception concerning the last state of the church, is evident from the signification of uttering voices, as denoting to instruct, in the present case, to instruct out of heaven, because it is said that the seven thunders uttered; and from the signification of the seven thunders, as denoting the Divine Truth as to understanding and perception (see above, n. 273). The thunders are said to be seven, because seven signifies all things, and what is full, and is used when things holy are treated of (see above, n. 20, 24, 257, 300). The reason why it relates to the last state of the church, concerning which John was instructed out of heaven by voices like thunder, is, that that state is treated of in the present chapter, as is evident from these words (in verse 7): "In the days of the voice of the seventh angel, when he is about to sound, the mystery of God shall also be consummated; as he hath declared in good tidings to his servants the prophets." And that [Divine Truth] shall still be taught in the church, before that state, which is the end, shall come, is meant by the last words of this chapter, "Thou must prophesy again over peoples, and nations, and tongues, and many kings" (verse 11). It is evident from these things, that by the seven thunders uttered their voices is signified instruction out of heaven, and perception, concerning the last state of the church.