Matt24:44

Therefore you also be ready, for the Son of Man is coming at an hour you do not expect. Almost everyone expects feast of trumpets.  Yom kippur is a Day hardly no one expects. It's the closing of the gates. The parable of the ten virgins matt25:10 rapture happens on the day door is closed.

Strong's 3677 Hebrew "appointed day" found in 2 places in bible also translated "Full Moon"

For the goodman is not at home , he is gone on a long journey: He has taken a bag of money with him and will come home at the full moon" Prov 7:19-20. 

"Blow the trumpet in the full moon... " Psalm 81:3. 

Last day rapture points to Tabernacles.

John 11:²⁴ Martha saith unto him, I know that he shall rise again in the resurrection at the last day.

John 7:37 In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink.

Jer17:13 "the Lord, the fountain of living waters."

God's calendar has changed before could he have another one that ends after the 3rd pilgrim feast ending year 5782.

 Which is months away from Nisan one.

Exd23:16 "the feast of ingathering, which is in the end of the year"

These two time frames are in line with 

  Lk13:6-9Barren Fig tree. 4th year tree was fertilized and was left alone, and on the 5th year fruit is ready to be picked. Lev 19:25 And in the fifth year you may eat its fruit,          5 years after jubilee lands on Tishri 10 2022  onwards.