Last year, I read several books by cosmologists and physicists on string theory, the Big Bang, and the creation of the universe. Recently, I've been reading books that try to advance how we got from our random planet to ever-evolving biological life (these books yet to be reviewed here). Coincidentally, my Sunday school class is starting new Gospel Project curriculum next week starting with Genesis 1, and I'm facilitating the discussion. As such, I thought it useful to go back and listen to Grudem's lectures from his book, which are available for free on iTunes.
In particular, there is one lecture on "The Doctrine of God", four lectures on "The Doctrine of Creation" and one on "What is Time?"
What is Time is actually a lecture and Q&A with Mike Mobley, from the Biodesign Institute at Arizona State Univ, and a PhD in Chemical Physics (he has a great CV). Mobley chimes in on several Grudem lectures as well.
Unlike Stephen Hawking and other string theorists currently, Mobley holds that the universe isn't infinite and has a beginning, roughly 15 billion years ago. A beginning necessitates a first cause. Time, space, and matter must all be created by an entity that exists outside them; he uses the analogy of someone operating a DVD. God can see all points in time because he exists outside it. (Mobley doesn't say it, but the standard model says that all moments in time already exist.) Unlike some young earth "creation scientists," Mobley holds that the speed of light is constant, and notes that if the speed of light were infinite, our world would have existed only for an instant. God must have had a purpose to make the speed of light what it is, so we exist for as long as we do. There is a lot in the lecture about special relativity, I felt he explained it all well.
"God changes the apparent past." Mobley uses the water-to-wine miracle as an example, tests on this likely would have shown that it had always been wine. God has the power to do that.
Many in the audience are young-earth creationists who are somewhat offended by the idea, while Grudem is more sympathetic to the 14 billion year old earth idea (and argues both are acceptable). Mobley believes that if the world is only 10,000 years old, then God made it look like it was 14 billion years old; if he created Adam as an adult, then he created an adult male of an old age who in reality was a much smaller age.
I recommend listening to all the above, along with the lectures on "The Providence of God" which get more into the idea of time and the problem of evil. Worth noting that William Lane Craig debates Grudem on what he has written and said about God and time which you can read here. There are other books mentioned in these lectures which I would like to read one day. Enjoy.