Creationist view of radiometric dating
Young earth creationists hold that both creation and the evolutionary position are at root tied to worldviews, and because they are both claims about historical (or prehistorical) events, they depend on untestable assumptions.At the same time, young earth creation scientists argue that the young universe view is the explanation that best fits the evidence.
This imposes a heavy burden on the testability of both theories, which is one of the reasons why some scientists question whether either the creationary or evolutionary view is scientific.
In such a scenario, time would pass at different rates on Earth and in outer parts of the universe, so that while 6,000 years went by on Earth, billions of years passed on the outer edge of the universe.
This model is also based on the Genesis account recording the days of creation according to time on Earth, rather than elsewhere. The evidence contradicts Humphrey's assumption that the earth is in a large gravity well.
If the earth were in such a gravity well, light from distant galaxies should be blue-shifted. Also, gravitational time dilation, if it existed on such a large scale, should be easily observable.
On the contrary, we observe (from the periods of Cepheid variable stars, from orbital rates of binary stars, from supernova extinction rates, from light frequencies, etc.) that such time dilation is minor.