Q: WHAT YEAR DID ABRAHAM LEAVE HARAN AND HEAD FOR THE PROMISED LAND?
A: IT DEPENDS WHAT CALENDAR YOU ARE USING!
On the Gregorian calendar (the one you might have on your wall) the year was 1958 BC.
On the Hebrew calendar, sometimes called the biblical calendar, the year was 2089 AM.
Abraham’s father died at age 205. Abraham was 75 when he began his journey to the promised land. Abraham left for the promised land 430 years before Israel left for the promised land. Israel left on the same day 430 years after Abraham, 2089 + 430 = 2519 year of exodus. See article titled The 430-400 Years.
Genesis 11:32 So the days of Terah were two hundred and five years, and Terah died in Haran.
Genesis 12:4 So Abram departed as the Lord had spoken to him, and Lot went with him. And Abram was seventy-five years old when he departed from Haran.
Exodus 12:40-41 Now the sojourn of the children of Israel who lived in Egypt was four hundred and thirty years. And it came to pass at the end of the four hundred and thirty years--on that very same day--it came to pass that all the armies of the Lord went out from the land of Egypt.