[just another ref]

Originally Posted by rfp

A lot of this debate has had to do with seeming errors committed by the timer (for being too slow) and the officials (for not looking at the clock after blowing the whistle).

But in my sitch, there were no errors. The timer responded as quickly as he could once he heard the whistle. Despite his immediate reaction, the horn signaled the end of the period. The officials did look up after blowing the whistle -- they saw 0:00.0. No mistake on anyone's part. But the officials and everyone else knows that the whistle came first followed very shortly by the final horn. There is "definite knowledge" that there was a lag between the whistle and the horn. The unknown is how much of a time difference. So the questions is, can you have definite knowledge without knowing the exact amount of time?

The phrase in the rule is "definite knowledge relative to the time involved."
Without knowing an exact amount, there is no definite knowledge.