FA-18439 / Time representation / Member archive

Negative UTC offset loses sign on its minute component · case 04

The decoded time state disagrees with the explicit regression oracle for offset.

Member previewVariant 4 · 3 implementations · 16 checks per implementation

Case contract

Controlled offset lexeme is Z or signed HH:MM with ASCII digits, hour<=14, minute<=59 and hour14 only minute00. Negative zero means unknown local offset and has no numeric UTC offset; positive zero and Z are known UTC. Return accepted, known, signed minute displacement and original negative-zero marker. No timezone database is consulted.

Why this case matters

Clock transfer and timestamp consumers require preserved coordinate, phase, validity and elapsed-time semantics.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 6	`[true, true, 330, false]`	`[true, true, -330, false]`	Failed

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