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You can get any date you like depending on the assumptions you make.
And that is what geologist do, they make up an assumed geological history for rock depending on the numbers that come from the geochronology lab (see Dating secrets).
But without reliable witnesses the accuracy of the watch makes no difference.
You can only establish the time for the race if it was timed by two or more qualified eyewitnesses who observed the start, the progress and the finish.
This illustrates the whole problem with the radioactive dating of geological events.
Those who promote the reliability of the method spend a lot of time impressing you with the details of radioactive decay, half-lives, mass-spectroscopes, etc.
They need to be active long enough to treat the condition, but they should also have a short enough half-life so that they don’t injure healthy cells and organs.
Radioactive dating is helpful for figuring out the age of ancient things.
Knowing about half-lives is important because it enables you to determine when a sample of radioactive material is safe to handle.
That is why you need at least two, sometimes three judges to measure the time of the race to the standard needed to enter the record books.
It would make no difference how accurate or high-tech the wristwatch was.
Without the starting time it is Actually, knowing the starting time is still not enough.
During the race you have to watch the swimmer and count how many laps he has swum so you know that he has done 1,500 metres.
A swimming race illustrates the simple principles involved in measuring time.