This is an excerpt from my book “Noah’s Flood: The Proof and Effects of It”, which has not been released yet.
How do we know from the Bible, that the earth is 6000 years old? The Bible gives us a chronological and genealogical Biblical history of people and events beginning from the time of creation, throughout history. It is possible, by adjusting for the differences in calendrical systems, to figure the time from creation in Genesis to the year A.D. 1. We cannot set a precise time, since most of the time the Bible only lists the time in years, and does not include the months and days. However, we can know that the time of creation was between 3900 BC and 4200 BC, making the earth a little over 6000 years old.
Many people have come up with dates for creation, such as Gerhard Hasel (4178 BC), Isaac Newton (4000 BC), and James Ussher (4004 BC).
I believe we can calculate the age of the earth using the scriptures as follows. Solomon became king in 971 B.C. (1 Kings 2:11). In the fourth year of his reign (967 B.C.), he began to build the temple which was four hundred and eighty years after the Israelites came out of Egypt (1 Kings 6:1). (967 + 480 = 1447 B.C.)
The Israelites were in Egypt four hundred and thirty years (Exodus 12:41). The Law was given to the Israelite people by God through Moses at Mount Sinai in the third month after they left Egypt (Exodus Chapters 19 & 20). God’s Covenant with Abraham was four hundred and thirty years before the Law was given to the Israelites (Galatians 3:17). (1447 + 430 = 1877 B.C.)
The Covenant with Abraham was nine hundred and ninety-one years after the Flood (Genesis Chapter 11 & Genesis 17:1-2). (1877 + 391 = 2268 B.C.)
The Flood occurred 1656 years after the week of Creation (Genesis Chapter 5 & Genesis 7:11). (2268 + 1656 = 3924 B.C.)
The beginning of the earth when God created it was approximately 3924 B.C.