The children of Isralel were under bondage for 430 years before they come out of the egypt. Exodus 12:41 says " They came out of the egypt on the last day of 430 years living in Egypt". From here we need to understand what God really wat us to figure out. The life in Egypt was of slave. Whoever commit sin,is the slave of sin.(Jn 8:34). The Children of Israel were slave for 430 years. God told Abram about the descendants of Him being slavery in Egypt for 400 years( Gn 15:13). But when they actually come out of Egypt, it was 430 years. 400 years represent 4000 years during the B.C era. And 30 years means the Life of Jesus in A.D Era. Jesus set us free from Sin. We were under bondage for over 4000 years before Jesus actually set us free on the cross. The date Adam actually disobeyed God was on Iyar 10th,4001 B.C. It was April 5th, 4001 BC in Gregorian calendar system. And Jesus set us free on April 4th,30 AD in gregorian calendar. (Numbers 33:3). It was on Thursday and it was Great day.(Jn 19:31). So here we can see mankind were under bondage of sin for exact 4030 years. Noah went into the Ark on Iyar 10th which is the same date (Not the same year though) Adam disobeyed God in 4001 B.C.
Jesus was born on Abib 1st, 5 B.C. (Exodus 40:2,17, Matt 1:23,Ex 25:8). It means Jesus spent 4 years in the B.C Era. and then 30 years in the A.D Era. In the same reason, 4 years in the B.C. Era represent the 4000 years under bondage of sin in the B.C Era.
Baby Jesus was not able to refuse evil and choose good for 4 years since the birth. and this represent the mankind were not able to understand what the good is and what the evil is for 4000 years. and they killed Jesus they began to understand the meaning of "picking the forbidden tree". Creator has given us everything except the life of Himself. But on the Cross, He has given us the very life of Himself as creator. Taking the life of creator is the sin. Mankind picked forbidden tree in 30 A.D. and they began to understand the true meaning of redemption.
Jesus could not refuse the evil and choose good until He became 5 years old, in the same way, mankind became to know how to refuse evil and choose good After the Crucifixion.
Before Christ : 4000 years.
Ministry of Jesus on earth : 30 years.
Construction of New Jerusalem = 3000 years.
Total : 7030 years. #7030 in Hebrew Concordance is Harp.(Rev 14:2).