It's funny how creationists have no idea how the timeline for creationism came about. That's what he did and did the math on the lifespans of the characters in the stories. He even sorted out an actual date of Creation.I don’t know who Ussher is, but one only needs to read the Old Testament to come up with a timeline.
As I noted it is absurd that creationists still hold on to a YEC scenario at all. It illustrates how theists tend to decide an idea is true and then work hard to make it all make sense regardless of the catastrophe it ends up being from an intellectual approach.