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Sub-hour band straddle (general)
Because the canonical unit is a whole UTC hour, ANY local band whose edges do not land on a UTC hour boundary produces fractional slot membership — from sub-hour offsets, from bands defined at :30 (e.g. daytime 09:30–16:30), or from DST. This is the same phenomenon as a geo cell straddling a boundary.
Class
Case to account for
Affects
2 conversions
01
Detection
(localBandEdgeMinute + zoneOffsetMinutes) % 60 !== 0.
02
Mitigation
01
Model the band as a weighted slot-set (fraction of the hour in each slot).
02
Pick one rule — overlap-weighted, majority, or edge-inclusive — and record it.
03
Affected conversions
Daypart (local band) ⇄ UTC slot-set
OPENBroadcast day (declared cutover) ⇄ slot-set
OPEN