Keeping track of time across different systems is not as straightforward as it might seem: every clock has its own notion of time, and always drifts around to a certain extent. There’s an entire community around the challenge of trying to keep track of time as accurately as possible. In an absolute sense, you can’t actually win in this game - it’s very Heisenberg-like, in that there will always be some uncertainty, even if only at the femtosecond level!
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