Apocalypse Explained #664
664. Verse 11. And after the three days and a half, signifies when it is finished, thus the end of the old church and the beginning of the New Church. This is evident from the signification of "the three days and a half," as being fullness and completion as to the end of the old church, when there is the beginning of the New Church (See above, n. 658). It is said "after the three days and a half" because in the Word "days" signify states, here the last state of the church; for in the Word all times, as "hours," "days," "weeks," "months," "years," "ages," signify states, as here the last state of the church, when there is no longer any good of love or truth of faith left. Because "days" signify states, and the establishment of the Most Ancient Church is treated of in the first chapter of Genesis, and it becomes established successively from one state to another, it is there said:
That there was evening and there was morning the first day, the second, the third, the fourth, the fifth, and the sixth days, even to the seventh, when it was finished (Genesis 1:5, 8, 13, 19, 23, 31; 2:2);
and the "days" there do not mean days, but the successive states of the regeneration of men at that time, and the consequent establishment of the church with them. So also elsewhere in the Word.
Arcana Coelestia #7987
7987. 'Even on this same day it was' means that it was at that very time. This is clear from the meaning of 'day' as state, dealt with in 23, 487, 488, 493, 2788, 3462, 3785, 4850, 5672, 5962, 7680. 'On this same day' consequently means in that state, and so at that very time, that is to say, when the Lord's Coming took place, meant by 'at the end of the four hundred and thirty years', and the deliverance of those belonging to the spiritual Church, meant by 'all the hosts of Jehovah went out of the land of Egypt'.