God told Moses that Nissan ( approx. April)  would be the beginning of the year for Israel, but we see even today Israel celebrates creation on Trumpets, a time in the fall season. But Scripture will not support Feast of Trumpets but the Feast of Tabernacles (Booths) 15 days later for Creation. Only going to use part of scripture relevant to the end of the year.
 
Deut. 16:13---You shall keep the feast of "Tabernacles" seven days, when you make your "ingathering" from your threshing floor and your wine press.
 
Exodus 23:16----You shall keep the feast of "ingathering" at the end of the year------
 
Exodus 34:22----And you shall observe the feast of weeks( Pentecost), the first fruits of the wheat harvest, and the feast of "ingathering" at the year's end.
 
Scripture clearly says the end of the year is Tabernacles and not Trumpets. The Feast of Tabernacles and the ingathering is synchronous.
 
When coupled with 3 very important facts Tabernacles could be the catching up of the church. 1. God is a perfect God and his timing is perfect. 2. All the early church fathers such as Barnabas, Irenaeus and others were consistant in saying when the six day (6000 years) ends, then the end would come. We know from the Bible the world is about 6000 years but we cannot assume our gregorian calendar is correct. How far can it be off? Using history and scriptures I found a four year error. After many years of time study, it is close as I can get------
 
Let's assume I am correct Tabernacles was the timing of creation, it fits what a perfect God would do because it would take a seven day feast to represent a seven day creation. Only Passover and Tabernacles meet this criteria.
 
Exactly 4000 years later to the Day Jesus was (convieved or born) per scripture---John 1:14--And the Word became flesh and Tabernacled with us. Another scripture that supports this is ---Malachi 4:2----But you who fear my name the Sun of Righteousness shall rise, with healing in his wings. Sun of Righteousness is none other than Jesus; and why Sun and not Son, because the 4th day of creation God made the Sun supporting his appearing after 4000 years.
 
So how do we correct time if our calendar is incorrect? In Daniel 70 X 7 prophecy we see it speaks of the future. Taking the first part of the prophecy of 7 X 7 years, from the word to restore Jerusalem to the coming of the Annointed One ( Messiah), a total of 49 years.
 
Jesus was about 30 when he started his ministry--Luke 3:23. His time of ministry I believe was 3 years and Irenaeus agrees with that. So that is 33 years.
 
Scripture also supports this from John 2:20--The The Jews than said, "It has taken us 46 years to build this temple-------    Adding 3 years of ministry gives us exactly the 49 years to their words.
 
Correcting Time----Taking the 49 years subtracting 33 years takes us back to 16 BC on our calendar taking into account God was perfecly on time at 4000 years or 0 AD.  History records Herod began building Jerusalem in 19 or 20 BC showing a 4 year error in time.
 
If there is any other error in time I am not aware of it, but we know the hour is almost upon us.  Maranatha.