When is your name written in the Lamb's Book of Life????

[Darcie]

I came across these verses this weekend, and I need some help in clarifing these verses.

Revelation 13:8

All who dwell on the earth will worship him, everyone whose name has not been written from the foundation of the world in the book of life of the Lamb who has been slain.

Revelation 17:8
8The beast that you saw was, and is not, and is about to come up out of the abyss and go to destruction And those who dwell on the earth, whose name has not been written in the book of life from the foundation of the world, will wonder when they see the beast, that he was and is not and will come.

Can it be that before the foundation of the earth names were already written or not written in the book of life?

What say ye? I would like to know your opinions/explanations. I'm not trying to stir things up. I sincerely just need some clarity.