TBK
Why are you talking about dates? The Bible does not deal with dates and that is the point. Adam became father to Seth - therefore Adam existed before Seth. Seth existed before Enosh - and so on and so forth. This is a chain of events, with each event exactly timestamped so to speak, resulting in Jesus Christ.
You can put any date you want on Adam's creation but all else in the chain must reflect whatever date you put on Adam's creation. So the date is of secondary importance to the actual passage of time.
You cannot put exact times on the supposed events in the Evolution Myth. And the very fact that an evolutionist would say, as you have said - "about 150,000 years" shows there is doubt and a lot of uncertainty. If you put another zero on that number, would it matter? Does it have to be exact?
The Bible is exact regarding time.