Well I think we have it narrowed down withing 50 million years or so.
I am by no means religious and find the 7 day earth idea silly but, in truth very few of us are scientists and fewer still have preformed the experiments designed to answer these questions. So there is a bit of faith involved in believing they are truthful and actually know what they are doing. I’m more worried about the people that think God has told them how the earth is going to end than the ones arguing how it began. I remember reading an article about scientist using carbon dating to estimate the age of the Sphinx. So riddle me this if you have a 2 billion year old rock you chop it into a different shape how does that change its age. This wasn’t explained but I can only assume they were testing the organic matter mixed in with the mortar but they didn’t bother to explain that since knuckleheads like myself shouldn’t be questioning big brained scientists.