On the 15th of
Nisan 2023 AM (years from creation), God made a covenant with Abraham and his decedents. Exactly 430 years later on the first day of Unleavened Bread, the children of Israel left Egypt. They were not slaves in Egypt for 430 years. There are 215 years from the Abrahamic covenant until Jacob moved to Egypt. They lived freely in Egypt for 95 years and slaves for about 120 years. There are 430 years from the Abrahamic covenant to the Mosaic covenant.
It came to pass at the end of the four hundred and thirty years, even the same day it came to pass, that all the hosts of the Lord went out from the land of Egypt (
Exodus 12:41)
The blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith. And this I say, that the covenant, that was confirmed before of God in Christ, the Law, which was four hundred and thirty years after [the Abrahamic covenant], cannot disannul, that it should make the promise of none effect (
Galatians 3:14, 17).
Jesus Christ was crucified on Passover (14th of
Nisan), buried by Unleavened Bread (15th of
Nisan) and rose again on Firstfruits (18th of
Nisan). The Abrahamic covenant, the exodus from Egypt and redemption were on the same days on the
Jewish calendar. God told Abraham and Moses the exact days of redemption.
Now is Christ risen from the dead, and become the firstfruits of them that slept. For as in Adam all die, even so in Christ shall all be made alive (
1 Corinthians 15:20-22).
The covenants of Abraham and Moses were fulfilled in our redemption though Jesus Christ. Those days are fulfilled once more. The Tribulation begins on the 10th of Tishri or the Day of Atonement. Count 3½ years later. The middle of the Tribulation is the 10th of Nisan, the day the lamb was chosen for Passover. The Antichrist begins his reign over the world. The two witnesses will be killed on the 14th of Nisan or Passover and resurrect on the 18th of Nisan or Firstfruits.
When they [two witnesses] shall have finished their testimony, the beast that ascends out of the bottomless pit shall make war against them, and shall overcome them, and kill them. And after three days and a half the spirit of life from God entered into them, and they stood upon their feet; and great fear fell upon them which saw them (Revelation 11:7, 11).
Through the Abrahamic covenant, the exodus out of Egypt and the New Covenant in Jesus Christ, we see God's plan fulfilled in God's time. Redemption is completed in Trumpets with His return for His people, Atonement with His return to earth and Tabernacles with His reign on earth. The pattern of God's time helps us understand God's plan for the past and the future.
References: 21st Century Revelation: World Wars, Iraq Wars & End Wars Chapter 10 - Seven Days of God, Chapters 13 - Minor Feast, Major Events, Chapter 16 - The Life of Christ, Chapter 17 - Basic Bible Chronology