when mankind (and/or the church) will be given their last opportunity to repent before the tenth day which will be Yom Kippur or the Day of Atonement.

I said, Speak on, my Lord
Then answered he me, and said, The more thou searchest, the more thou shalt marvel; for the world hasteth fast to pass away,

(1 Samuel, chapter 25)
That typifies the final ten days.
This is the story of a man who was given the opportunity to be a part of the coming kingdom of Israel under David; a type of the kingdom of God under Jesus. He refuses the offer and although he does not know it, has ten days to change his mind and repent
II Esdras 4:28-42
28    But as concerning the things whereof thou askest me, I will tell thee; for the evil is sown, but the destruction thereof is not yet come.
aro_red_sm.gif (829 bytes)29    If therefore that which is sown be not turned upside down, and if the place where the evil is sown pass not away, then cannot it come that is sown with good.
aro_red_sm.gif (829 bytes)30    For the grain of evil seed hath been sown in the heart of Adam from the beginning, and how much ungodliness hath it brought up unto this time? and how much shall it yet bring forth until the time of threshing come?
31    Ponder now by thyself, how great fruit of wickedness the grain of evil seed hath brought forth.
32    And when the ears shall be cut down, which are without number, how great a floor shall they fill?
33    Then I answered and said, How, and when shall these things come to pass? wherefore are our years few and evil?
34    And he answered me, saying, Do not thou hasten above the most Highest: for thy haste is in vain to be above him, for thou hast much exceeded.
35    Did not the souls also of the righteous ask question of these things in their chambers, saying, How long shall I hope on this fashion? when cometh the fruit of the floor of our reward?
36    And unto these things Uriel the archangel gave them answer, and said, Even when the number of seeds is filled in you: for he hath weighed the world in the balance.
37    By measure hath he measured the times; and by number hath he numbered the times; and he doth not move nor stir them, until the said measure be fulfilled.
38    Then answered I and said, O Lord that bearest rule, even we all are full of impiety.
39    And for our sakes peradventure it is that the floors of the righteous are not filled, because of the sins of them that dwell upon the earth.
40    So he answered me, and said, Go thy way to a woman with child, and ask of her when she hath fulfilled her nine months, if her womb may keep the birth any longer within her.
41    Then said I, No, Lord, that can she not. And he said unto me, In the grave the chambers of souls are like the womb of a woman:
42    For like as a woman that travaileth maketh haste to escape the necessity of the travail: even so do these places haste to deliver those things that are committed unto them.

(Selah)  "think of that"
Feast Days to Know the Seasons
l. Passover Fourteenth day of the first month. Jesus was crucified. Jesus became our Passover
(fulfilled).
2. Unleavened Bread Fifteenth day of the first month. Jesus buried. The middle loaf of bread is hidden or buried
(fulfilled).
3. Firstfruits Sunday following Unleavened Bread. Jesus resurrected. He became the Firstfruits of them that died
(fulfilled).
4. Pentecost Also called Feast of Weeks in the Old Testament. Fiftieth day after Firstfruits. The Holy Spirit came in His fullness (fulfilled).
5. Trumpets First day of the seventh month. The Rapture
(not yet fulfilled). Next major event.    (Repentance Is Yet Possible…?)
6. Atonement
Tenth day of the seventh month. Repentance of Israel. When they shall look upon Him, Whom theyhave pierced (not yet fulfilled).
7. Tabernacles Fifteenth day of the seventh month. The coming state of rest. Jesus reigns on earth for one thousand years
(not yet fulfilled).

Feast Days