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Reversed (Southern Hemisphere) DST
DST runs in the opposite calendar months south of the equator, and transition dates differ per country within the same offset. The same UTC slot is a different local season and local hour band in Sydney vs New York.
Class
Case to account for
Affects
2 conversions
01
Detection
Zone DST calendar / hemisphere.
02
Mitigation
01
Never compare local semantics (primetime, morning) across hemispheres by UTC slot alone.
02
Carry a local annotation alongside the UTC slot.
03
Affected conversions
Daypart (local band) ⇄ UTC slot-set
OPENsemantics
OPEN