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Many important buildings for government, schools, and churches have a cornerstone showing the year of construction.
Determining the age of a real rock is a bit more complicated.
For example, the first physical evidence of the age of the earth came from a technique analyzing the decay of Uranium into Lead.
How radiometric dating works in general Why methods in general are inaccurate Why K-Ar dating is inaccurate The branching ratio problem How Errors Can Account for the Observed Dates Why older dates would be found lower in the geologic column especially for K-Ar dating Do different methods agree with each other on the geologic column?
Note how the oldest rocks in the Grand Canyon are on the bottom and the youngest rocks are on the top (more about layers).: Carbon-14 is the best known radiometric dating technique, but it can only be used to date objects younger than about 40,000 years.
It also only works for objects that contain carbon.
This cartoon of the Grand Canyon shows the names of individual layers.
Determining the when this building was built is very easy -- you just read it off of the cornerstone.We are told that these methods are accurate to a few percent, and that there are many different methods.We are told that of all the radiometric dates that are measured, only a few percent are anomalous.The universe is full of naturally occurring radioactive elements.Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms." When molten rock cools, forming what are called igneous rocks, radioactive atoms are trapped inside. By measuring the quantity of unstable atoms left in a rock and comparing it to the quantity of stable daughter atoms in the rock, scientists can estimate the amount of time that has passed since that rock formed.
Even the creationist accounts that I have read do not adequately treat these issues.