Turing Machines and Fuzzy Systems

So Turing Machines are based on symbols. But what if no two symbols are exactly alike, especially in time? Does it matter? Can a Turing machine recognize a symbol which is not exactly like what it's expecting? This is the whole problem with classical Turing machines, that they are based on symbols which are exact. (perhaps not quantum Turing machines)

Oscillating or Fuzzy or Uncertain Time

So if we are unsure of things in space, perhaps we can have uncertainty in time as well. Perhaps I can say it's 9pm + or - 7 minutes. Since we have time zones, we don't really know what the real exact time is, we are generally within one hour of the actual time. That provides a lot of leeway.