Radio carbon dating stone
Rarely do we have people from thousands of years ago who are writing, who are signing confessions.
So there's no one easy way that we know what the date of the pyramids happens to be. The pyramids are surrounded by cemeteries of other tombs. Sometimes we find organic materials, like fragments of reed, and wood, wooden coffins.
People wonder how millions of years could be squeezed into the biblical account of history. Christians, by definition, take the statements of Jesus Christ seriously.
Clearly, such huge time periods cannot be fitted into the Bible without compromising what the Bible says about the goodness of God and the origin of sin, death and suffering—the reason Jesus came into the world (See Six Days? He said, This only makes sense with a time-line beginning with the creation week thousands of years ago.
It makes no sense at all if man appeared at the end of billions of years.
There are people coming from a New Age perspective who want the pyramids to be very old, much older than Egyptologists are willing to agree.
Carbon has unique properties that are essential for life on Earth.
Familiar to us as the black substance in charred wood, as diamonds, and the graphite in “lead” pencils, carbon comes in several forms, or isotopes.
We find the bones of the people who lived and were buried in these tombs. But primarily we date the pyramids by their position in the development of Egyptian architecture and material culture over the broad sweep of 3,000 years.
So we're not dealing with any one foothold of factual knowledge at Giza itself.