FA-313 / Time representation / Member archive

Duration formatting wraps elapsed hours at midnight · case 03

A multi-day duration loses its day component, and a negative duration looks like a positive time of day.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Format an integer microsecond duration as optional '-' followed by H:MM:SS.ffffff. Hours are unbounded, minutes and seconds are 00 through 59, and zero has no negative sign.

Why this case matters

Elapsed durations are not times of day. Reusing clock formatting can conceal long outages or reverse the apparent sign of a measurement.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
multi-day positive duration	`"3:02:01.000003"`	`"75:02:01.000003"`	Failed

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