FA-78652 / Broadcast timecode arithmetic / Member archive

Programme-relative signed timecode: zero sign · case 02

The programme start itself is labelled -00:00:00:00.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

Express label tc relative to programme start as "+HH:MM:SS:FF" or "-HH:MM:SS:FF" along the shorter way round the 24-hour clock (an offset of exactly 12 hours is negative). Zero is "+".

Why this case matters

Timecode arithmetic errors misplace edits, commercial breaks and captions against the broadcast clock.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: zero sign	`"-00:00:00:00"`	`"+00:00:00:00"`	Failed

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