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45-minute offset zones
Nepal (+5:45), the Chatham Islands (+12:45 / +13:45 DST), and the Australian Eucla region (+8:45) are offset by three quarters of an hour. A local hour straddles a UTC slot 45/15, so even majority assignment is badly lopsided.
Class
Case to account for
Affects
2 conversions
01
Detection
zoneOffsetMinutes % 60 === 45 (or === 15).
02
Mitigation
01
Overlap-weighted apportionment only; never snap a 45-minute-straddled hour to a single slot.
02
Carry the fractional weights through to reporting so the bias is visible.
03
Affected conversions
Daypart (local band) ⇄ UTC slot-set
OPENBroadcast day (declared cutover) ⇄ slot-set
OPEN